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Viven Stanshall
Guest
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 Posted: Thu Dec 11, 2003 6:12 pm Post subject: New power supply, new motherboard - nothing happens! |
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My 250W power supply burned out the other week; I left the room for
half an hour, and came back to a nasty smell and a dead pc. I fitted
a new 350W power supply, but nothing worked. I had been considering a
new motherboard and faster processor anyway, so bought both as a
bundle, with heatsink and fan. However, nothing would work, no hard
drive spin, no beeps, no psu fan. Even with nothing attached to the
board except the psu, nothing happens when I push the start button,
except the power LED coming on. I have tried a third (550W) psu just
in case the first replacement was faulty, but no dice. I have also
tried with the motherboard out of the case, to make sure it wasn't
shorting on the mountings.
Any suggestions? Should the psu fan come on with a bare motherboard
and processor, or does anything else have to be attached?
Vivien Stanshall |
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JAD
Guest
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| Posted: Thu Dec 11, 2003 10:26 pm Post subject: Re: New power supply, new motherboard - nothing happens! |
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Even with nothing attached to the
board except the PSU, nothing happens when I push the start button,
except the power LED coming on.
Nothing will happen in that situation.
The PSU may have the voltage select switch set wrong
The CPU is not seated correctly
The video card is not seated properly
The memory has been burned/not in the proper slot
"Viven Stanshall" <fid.def@virgin.net> wrote in message news:f6a1d424.0312110412.1b526758@posting.google.com...
| Quote: | My 250W power supply burned out the other week; I left the room for
half an hour, and came back to a nasty smell and a dead pc. I fitted
a new 350W power supply, but nothing worked. I had been considering a
new motherboard and faster processor anyway, so bought both as a
bundle, with heatsink and fan. However, nothing would work, no hard
drive spin, no beeps, no psu fan. Even with nothing attached to the
board except the psu, nothing happens when I push the start button,
except the power LED coming on. I have tried a third (550W) psu just
in case the first replacement was faulty, but no dice. I have also
tried with the motherboard out of the case, to make sure it wasn't
shorting on the mountings.
Any suggestions? Should the psu fan come on with a bare motherboard
and processor, or does anything else have to be attached?
Vivien Stanshall |
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Ralph Mowery
Guest
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| Posted: Fri Dec 12, 2003 5:21 am Post subject: Re: New power supply, new motherboard - nothing happens! |
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| Quote: | My 250W power supply burned out the other week; I left the room for
half an hour, and came back to a nasty smell and a dead pc. I fitted
a new 350W power supply, but nothing worked. I had been considering a
new motherboard and faster processor anyway, so bought both as a
bundle, with heatsink and fan. However, nothing would work, no hard
drive spin, no beeps, no psu fan. Even with nothing attached to the
board except the psu, nothing happens when I push the start button,
except the power LED coming on. I have tried a third (550W) psu just
in case the first replacement was faulty, but no dice. I have also
tried with the motherboard out of the case, to make sure it wasn't
shorting on the mountings.
Any suggestions? Should the psu fan come on with a bare motherboard
and processor, or does anything else have to be attached?
|
To test an ATX power supply:
| Quote: |
First, disconnect everything from the power supply (including MB.) Plug
AC cord into the rear of the PS. IF the PS has its own rocker on/off
switch, turn it ON. There should be +5v on pin 9 of the 20 pin connector
(+5vsb, usually a violet wire.) There should be >0.8v on pin 14 (PS-ON,
usually a green wire.) This is from an internal pull-up to the +5vsb.
Connect PS power leads to 1 or 2 IDE HDs (for a load). Jumper pin 14
(PS-ON) to pin 13 (ground, black wire.) At this point, fan in PS should
start spinning, drives should spin, and + 5/12v, -5/12v, +3.3v, and
+5vsb should be present at 20 pin connector.
Disconnecting pin 14-13 jumper should turn supply back off.
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Guest
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| Posted: Fri Dec 12, 2003 9:57 am Post subject: Re: New power supply, new motherboard - nothing happens! |
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The Power Supply may require an initial load before it will boot. Try
attaching a hard drive and maybe a video card and a Floppy to boot
from.
A common problem is the motherboard shorting out to the metal part of
the case. Another problem can be Bad Memory.
Put a processor and memory on the motherboard with a video card or
integrated video and attach a monitor and see what it will do.
Sometimes a mounting post will come up in the wrong place and short
out the motherboard. You can test the motherboard on any
non-conductive surface. Just plug in the power supply and then touch
the two pins the soft on power switch goes to so the power supply will
turn on.
A new motherboard must have the CPU FAN plugged in to the right socket
on the motherboard. If you have the jumpers set wrong you may not get
any good results. Most processors are locked so they will not be
usable if you have the wrong settings. Try auto settings if possible
and use jumper free mode.
On 11 Dec 2003 04:12:32 -0800, fid.def@virgin.net (Viven Stanshall)
wrote:
| Quote: | My 250W power supply burned out the other week; I left the room for
half an hour, and came back to a nasty smell and a dead pc. I fitted
a new 350W power supply, but nothing worked. I had been considering a
new motherboard and faster processor anyway, so bought both as a
bundle, with heatsink and fan. However, nothing would work, no hard
drive spin, no beeps, no psu fan. Even with nothing attached to the
board except the psu, nothing happens when I push the start button,
except the power LED coming on. I have tried a third (550W) psu just
in case the first replacement was faulty, but no dice. I have also
tried with the motherboard out of the case, to make sure it wasn't
shorting on the mountings.
Any suggestions? Should the psu fan come on with a bare motherboard
and processor, or does anything else have to be attached?
Vivien Stanshall |
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ric
Guest
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| Posted: Fri Dec 12, 2003 11:54 am Post subject: Re: New power supply, new motherboard - nothing happens! |
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Ralph Mowery wrote:
| Quote: | To test an ATX power supply:
First, disconnect everything from the power supply (including MB.) Plug
AC cord into the rear of the PS. IF the PS has its own rocker on/off
switch, turn it ON. There should be +5v on pin 9 of the 20 pin connector
(+5vsb, usually a violet wire.) There should be >0.8v on pin 14 (PS-ON,
usually a green wire.) This is from an internal pull-up to the +5vsb.
Connect PS power leads to 1 or 2 IDE HDs (for a load). Jumper pin 14
(PS-ON) to pin 13 (ground, black wire.) At this point, fan in PS should
start spinning, drives should spin, and + 5/12v, -5/12v, +3.3v, and
+5vsb should be present at 20 pin connector.
Disconnecting pin 14-13 jumper should turn supply back off.
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Hmmm...that sure looks familiar.  |
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Ralph Mowery
Guest
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| Posted: Sat Dec 13, 2003 9:54 am Post subject: Re: New power supply, new motherboard - nothing happens! |
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| Quote: | Connect PS power leads to 1 or 2 IDE HDs (for a load). Jumper pin 14
(PS-ON) to pin 13 (ground, black wire.) At this point, fan in PS
should
start spinning, drives should spin, and + 5/12v, -5/12v, +3.3v, and
+5vsb should be present at 20 pin connector.
Disconnecting pin 14-13 jumper should turn supply back off.
Hmmm...that sure looks familiar.
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Could be . If I find a good response to a problem I will save it to a file
on the hard drive and copy and past it. |
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