Those are some very diverse symptoms. They could be from bad mainboards, or
they could be from bad power supplies. Swapping the mainboards between the
cases won't help you isolate what is wrong here. Better to test the power
supplies on the bench to make sure they are good, then bench test each
mainboard with just onboard video and RAM in place with a third, known good
power supply. Did you recently suffer any power glitches like a surge, a
brownout, or a blackout? Also, what are the specs on these two machines? Do
they use identical components?
Kenneth Whyman
[log in to unmask]
"Chance favors the prepared mind."
On Wed, Feb 11, 2009 at 10:11 AM, Aung Maw <[log in to unmask]> wrote:
> Dear Sir,
>
> My home got 2 PC...
> recently, both PC can't work just a few days different.
>
> 1st one: When power ON it start to boot up as normal. On the half way it
> suddenly stopped everything.
> press power again, it start again and stop suddenly. Sometime, it stop
> immediately after beep sound.
> sometime it stopped when windows is about to load. sometime it stop while
> POST and RAM checking....
>
> 2nd one: Totally nothing come out. No beep, no monitor signal.
> Before pressing button, when power up, its power and HDD light on. Optical
> drive light on. CPU fan is turning... hear a little sound from HDD. Thats
> all. Nothing happened after that. both HDD and Power light is still on.
> When press power button for a few sec. Both light goes off. but Ethernet
> card and MTB light is still on.
>
> I tried swap CPU and RAM between two PC. Same thing.
> I tried reset CMOS .. No different.
> IT seems that CPU and RAM has no problem.
> But both motherboard can be spoiled???
> Is there any other possibilities.
>
> Can advise anything???
>
> Thank you
>
> Visit our website regularly for FAQs,
> articles, how-to's, tech tips and much more
> http://freepctech.com
>
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