E
Eric Edwards
With a post code of FF, no beeps, and no boot, does that mean dead cpu
or dead motherboard? Or is there any way to tell?
or dead motherboard? Or is there any way to tell?
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B
Blaedmon
could also be just a bios corruption. If you're able, do a hotflash. If not,
again if youre able, replace the cpu, etc. Narrow it down.
again if youre able, replace the cpu, etc. Narrow it down.
P
Paul
could also be just a bios corruption. If you're able, do a hotflash. If not,
again if youre able, replace the cpu, etc. Narrow it down.
The POST card code of FF tells me that the PSU started and the
POST card got some power.
Try the following (the "cardboard test").
Remove the motherboard from the case. Install only the CPU,
no memory or video card. Remove all wiring from the
PANEL header. Disconnect all disk drives. Turn on the PSU.
The green LED on the motherboard indicates +5VSB. Now, touch
a screwdriver tip to the two terminals on the PANEL header,
where the power switch normally goes. If the CPU fan begins
to spin, at least the PSU started.
With only the CPU, the BIOS should be able to run, and when
it finds no memory/no video card, it should beep like crazy,
and the repetitive beeping means the BIOS code is running
in a loop.
If that doesn't work, the only way to fault isolate any better
than that, is to place the CPU in another, known to be good
motherboard.
If the CPU tests good in another computer, then it could be
the motherboard, or as Blaedmon points out, a BIOS corruption
could also stop the booting process. I think the BIOS has
to run, in order to generate the single beep at power up
(not sure about that). You can get another BIOS chip from
badflash.com or you can also order one from Asus.
If the computer you are debugging was hit by lightning, or
suffered a power supply failure, be very careful what you do
with the components from that computer. For example, it is
possible for an electrical failure to kill a CPU, and then
when you put that CPU in another computer, it can kill the
motherboard on that computer as well. Similarly, moving a
known good CPU into the damaged machine, could end up killing
the known good CPU.
Moving components from a computer that has had some kind of
electrical failure carries some risk of damaging other
computers you use for testing.
HTH,
Paul
E
Eric Edwards
The POST card code of FF tells me that the PSU started and the
POST card got some power.
Try the following (the "cardboard test").
I've already done that. For what it's worth, the fans come on. From
the speaker, I get a two clicks (no beeeps) about 2 seconds apart. Sort
of "click on" and then "click off".
If the computer you are debugging was hit by lightning, or
suffered a power supply failure, be very careful what you do
with the components from that computer. For example, it is
possible for an electrical failure to kill a CPU, and then
when you put that CPU in another computer, it can kill the
motherboard on that computer as well. Similarly, moving a
known good CPU into the damaged machine, could end up killing
the known good CPU.
No lightning involved. It is possible (it is always possible) that
components were damaged by electrostatic discharge in handling.
However, I'm a little skeptical about damage to a motherboard from a bad
cpu or visa versa. Has this actually be observed? The possible over
voltages seem awfully low for a an IO that has any kind of ESD
protection.