Failing to boot

Hi,

I have had a homemade system (spec below) for about 18 months now with
no problems at all. Then yesterday the system failed to boot at all
and makes a constant beeping (high, low, high, low, etc). The POST
code displayed on my motherboard shows "02" which isn't in
my manual. I have seen on the net that the beeping could suggest a
processor problem, but was just wondering if anyone had any ideas as
to how I could be sure what the problem is.

Many thanks,

Pangear

SPEC:
Abit AI7-GURU SKT 478 Motherboard
Intel Pentium 4 3.0GHz (Prescott) Socket 478 Processor
Maxtor 6B160M0 Diamondmax 10 160GB Hard Drive
LG GSA-4163 16x DVD±RW DVD Drive
Antec SLK1650B Mini Tower Black - 350 Watt PSU