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John Leddy
Guest
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 Posted: Thu Apr 19, 2007 1:35 pm Post subject: Booting Machine |
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I always started my system by:
1. Turning on the switched surge protector which started the monitor
2. Pressing the start button on the front of the computer
The machine would then boot.
I replaced the old power supply with a new one that has a rocker on off
switch and I am now having trouble. To start the same way as before, I now
have to turn the power supply rocker switch on and off a few times to get
the machine to boot. Once started, all is fine. I also now have to do the
same thing to get the machine to wake up when in the sleep mode.
It has been recommended that I replace the power supply, but everything
works fine after the system boots.
Before I replace the power supply, I would like to know if there is a
procedure to start a system with a power supply that has a rocker on and off
switch. |
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Michael Hawes
Guest
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| Posted: Fri Apr 20, 2007 12:21 am Post subject: Re: Booting Machine |
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"John Leddy" <leddyjp@delhitel.net> wrote in message
news:f07r1j$ju8$1@theodyn.ncf.ca...
| Quote: | I always started my system by:
1. Turning on the switched surge protector which started the monitor
2. Pressing the start button on the front of the computer
The machine would then boot.
I replaced the old power supply with a new one that has a rocker on off
switch and I am now having trouble. To start the same way as before, I
now have to turn the power supply rocker switch on and off a few times to
get the machine to boot. Once started, all is fine. I also now have to
do the same thing to get the machine to wake up when in the sleep mode.
It has been recommended that I replace the power supply, but everything
works fine after the system boots.
Before I replace the power supply, I would like to know if there is a
procedure to start a system with a power supply that has a rocker on and
off switch.
Rocker switch is NOT your problem. Why did you replace the PSU? What |
make/model is new supply? What was original make/model? There are a lot of
cheap rubbish PSUs out there. Switching on PSU experiences power surges
from various items which cause problems to faulty/crap PSUs, thats why it's
OK when it DOES manage to start. The fact that you have to flip the rocker
switch shows that the PSU is tripping out at power on.
Mike. |
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John Leddy
Guest
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| Posted: Fri Apr 20, 2007 5:43 am Post subject: Re: Booting Machine |
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Mike:
I have an older emachines of which I added a graphics card and an audio
card. I felt that the original power supply wouldn't be adequate along with
an additional hard drive.
I installed what I thought was a quality new power supply. I installed a
MGE XG Vortec 600 Watt Power supply and it is supposed to have a lifetime
warranty. I don't know about the company as I haven't received the rebate
yet!
If you suggest, I will reinstall the old emachines power supply (250 watts)
and see what happens.
Thanks for the help!
John
"Michael Hawes" <michael.hawes1remove@tiscali.co.uk> wrote in message
news:4627f17c_2@mk-nntp-2.news.uk.tiscali.com...
| Quote: |
"John Leddy" <leddyjp@delhitel.net> wrote in message
news:f07r1j$ju8$1@theodyn.ncf.ca...
I always started my system by:
1. Turning on the switched surge protector which started the monitor
2. Pressing the start button on the front of the computer
The machine would then boot.
I replaced the old power supply with a new one that has a rocker on off
switch and I am now having trouble. To start the same way as before, I
now have to turn the power supply rocker switch on and off a few times to
get the machine to boot. Once started, all is fine. I also now have to
do the same thing to get the machine to wake up when in the sleep mode.
It has been recommended that I replace the power supply, but everything
works fine after the system boots.
Before I replace the power supply, I would like to know if there is a
procedure to start a system with a power supply that has a rocker on and
off switch.
Rocker switch is NOT your problem. Why did you replace the PSU? What
make/model is new supply? What was original make/model? There are a lot of
cheap rubbish PSUs out there. Switching on PSU experiences power surges
from various items which cause problems to faulty/crap PSUs, thats why
it's OK when it DOES manage to start. The fact that you have to flip the
rocker switch shows that the PSU is tripping out at power on.
Mike.
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Paul
Guest
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| Posted: Fri Apr 20, 2007 10:26 am Post subject: Re: Booting Machine |
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John Leddy wrote:
| Quote: | Mike:
I have an older emachines of which I added a graphics card and an audio
card. I felt that the original power supply wouldn't be adequate along with
an additional hard drive.
I installed what I thought was a quality new power supply. I installed a
MGE XG Vortec 600 Watt Power supply and it is supposed to have a lifetime
warranty. I don't know about the company as I haven't received the rebate
yet!
If you suggest, I will reinstall the old emachines power supply (250 watts)
and see what happens.
Thanks for the help!
John
|
At the very least, do not quickly alternate the toggle switch on the back
of an ATX supply. The switch on the back of the supply is not intended
for that kind of operation.
To see why, take a look at this power supply schematic. You will only
need to look at a very small section, to see the nature of the problem.
http://www.pavouk.org/hw/en_atxps.html
NTCR1, in the upper left hand corner of the schematic, is called an
"inrush limiter". It is a thermistor device. That particular one,
when it is cold, it has a high resistance. When the thermistor gets
hot (from self-heating after powerup), the resistance drops to a lower
value.
When the resistance is high, when the power supply is cold, NTCR1 limits
the amount of current charging C5 and C6, the main primary side capacitors.
Limiting the current, helps protect D21,D22,D23,D24, the bridge rectifier.
When you see the lights flicker in your computer room, that is
because of the huge current flow into C5 and C6.
Now, if you rapidly toggle the power switch on and off, NTCR1 is already
hot, and its resistance is low. Much greater currents now flow into the
supply, into C5 and C6. The diodes D21,D22,D23,D24 could be damaged, after
enough repetitions.
In other words, if you switch off an ATX supply, you should wait a number
of seconds, until NTCR1 cools off a bit, before flipping the switch on
again.
An ATX supply is supposed to be "switched" on and off, via the power
button on the front of your computer. Figure out why that is not
happening, rather than torturing the power supply. Otherwise, you
could be in for an expensive lesson (like a fried computer).
If you feel the need to switch the monitor on and off using a power
strip, connect a separate power strip between the monitor and your
main power strip. That way, you can leave the Emachine's new power
supply always "ON" at the back, then use the front power button on the
front of the computer to turn it on and off. PS_ON is what the motherboard
uses to turn an ATX supply on and off. The PS_ON method is not stressful,
like that toggle switch on the back is.
<---------- Main_Surge_Protected_Strip <------ second_strip <--- monitor
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|"ON"
ATX_PSU_in_Emachine
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| (PS_ON signal, main power cable)
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Motherboard
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Front_Power_Button
Paul |
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Frank McCoy
Guest
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| Posted: Fri Apr 20, 2007 10:31 am Post subject: Re: Booting Machine |
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In alt.comp.hardware.pc-homebuilt Paul <nospam@needed.com> wrote:
| Quote: | John Leddy wrote:
Mike:
I have an older emachines of which I added a graphics card and an audio
card. I felt that the original power supply wouldn't be adequate along with
an additional hard drive.
I installed what I thought was a quality new power supply. I installed a
MGE XG Vortec 600 Watt Power supply and it is supposed to have a lifetime
warranty. I don't know about the company as I haven't received the rebate
yet!
If you suggest, I will reinstall the old emachines power supply (250 watts)
and see what happens.
Thanks for the help!
John
At the very least, do not quickly alternate the toggle switch on the back
of an ATX supply. The switch on the back of the supply is not intended
for that kind of operation.
To see why, take a look at this power supply schematic. You will only
need to look at a very small section, to see the nature of the problem.
http://www.pavouk.org/hw/en_atxps.html
NTCR1, in the upper left hand corner of the schematic, is called an
"inrush limiter". It is a thermistor device. That particular one,
when it is cold, it has a high resistance. When the thermistor gets
hot (from self-heating after powerup), the resistance drops to a lower
value.
When the resistance is high, when the power supply is cold, NTCR1 limits
the amount of current charging C5 and C6, the main primary side capacitors.
Limiting the current, helps protect D21,D22,D23,D24, the bridge rectifier.
When you see the lights flicker in your computer room, that is
because of the huge current flow into C5 and C6.
Now, if you rapidly toggle the power switch on and off, NTCR1 is already
hot, and its resistance is low. Much greater currents now flow into the
supply, into C5 and C6. The diodes D21,D22,D23,D24 could be damaged, after
enough repetitions.
In other words, if you switch off an ATX supply, you should wait a number
of seconds, until NTCR1 cools off a bit, before flipping the switch on
again.
An ATX supply is supposed to be "switched" on and off, via the power
button on the front of your computer. Figure out why that is not
happening, rather than torturing the power supply. Otherwise, you
could be in for an expensive lesson (like a fried computer).
If you feel the need to switch the monitor on and off using a power
strip, connect a separate power strip between the monitor and your
main power strip. That way, you can leave the Emachine's new power
supply always "ON" at the back, then use the front power button on the
front of the computer to turn it on and off. PS_ON is what the motherboard
uses to turn an ATX supply on and off. The PS_ON method is not stressful,
like that toggle switch on the back is.
---------- Main_Surge_Protected_Strip <------ second_strip <--- monitor
|
|"ON"
ATX_PSU_in_Emachine
|
| (PS_ON signal, main power cable)
|
Motherboard
|
Front_Power_Button
Paul
|
A thought:
Once running, go into the BIOS and see if there's an option about
booting when powering up instead of hitting the power switch.
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