I concur at the remove everything then add one by one and would offer
this. Memory, CPU, or MOBO all generally issue beep codes when in
failure mode, power supplies don't (if the right section of the power
fails, i.e. not the fan/hd side). My bet is on a power supply,
especially if you have had any weather that could produce a spike in
voltage. Try unplugging the power supply, memory, and all cabled
connectors on the MOBO, and plug them back in. I've seen this wake a
dead machine more than two hands of counting worth.
Luther KB5QHU
Forest Park, IL
1998 ML320 157,xxx
On 10/31/2012 7:33 PM, Rick Knoble wrote:
Troubleshooting hardware is a tedious process. It is easier, albeit no less
tedious if you have enough spare parts to construct another computer. My first
suspect in your instance would be the power supply. If you have a spare, swap
them out and see. If you don't have a spare, pull the old one out and have a
computer shop test it. If that tests good, disconnect all peripheral devices,
HDD's Floppy drive, DVD drive, and any other boards. If it POSTs shut it down,
and hook up devices one by one until you find the culprit. If it doesn't POST,
memory, CPU, or MOBO is suspect. Having known good memory and a known good CPU
would be a big help here. Also, inspect the MOBO and all cards for bulging or
popped capacitors. A visual inspection could be very revealing.
I had a home built computer that did the same exact thing and it turned out to
be the video card being bad. I have seen failed memory, failing hard drives,
bad floppy drives, optical drives crapping out, and failed power supply's all
cause similar problems. Memory problems can be found with a mem check program
run from a live CDROM. The only way to isolate other problems is trial and
error. Like I first stated, I would start with the power supply. It is the
first in the list of usual suspects.
Rick
Sent from my iPhone
On Oct 31, 2012, at 7:08 PM, "Greg Fiorentino" <gf...@dslnorthwest.net> wrote:
OK, so my home-cobbled HTPC started acting flaky a few days ago. Sudden
reboots, BIOS date gone, changing BIOS settings uncommanded, one CMOS
checksum error. I assumed unit needed vacuuming, possible CMOS battery
failure, possible power supply failure. Vacuumed, replaced P/S with new
spare, tested CMOS battery shows 3.37V.
Now I get no POST at all, no beeps either even after CMOS reset. Most
likely problem MoBo? Possibly BIOS chip? This has been up and running for
about 4 ½ years, with a CPU upgrade from a 2X to a 4X
Setup:
Silverstone case
Biostar TA760G M2+ MoBo
AMD Phenom™ II X4 Processor
Gskill DDR2-1066 PC2-8500 2G X 2
WinXP Pro
I have ordered a PCI POST Tester to diagnose, but some of you nerds probably
have some insight into this.
If I have to replace the MoBo I would like to retain the CPU, RAM and Micro
ATX form factor compatibility. The Biostar is NLA, but there is an outfit
in Germany that supplies BIOS chips for it.
TIA for any suggestions, comments or snide remarks.
Greg
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