My PC locked up at pre-boot

[a]

Hi
I have posted this problem about one week ago.
The problem was fixed by no reason for a while, and now it comes back again.

Problem description
My PC is locked up at pre-POST stage.
The keyboard light is flashed once. I have replaced the battery.
99% of the time, no monitor signal received.

1% of the time, the monitor receives signal and it shows that the boot
sequence halts at "Initialize Plug and Play devices"

So, how should I narrow down the troubleshooting?

Thanks

 

[Malke]

Hi
I have posted this problem about one week ago.
The problem was fixed by no reason for a while, and now it comes back again.

Problem description
My PC is locked up at pre-POST stage.
The keyboard light is flashed once. I have replaced the battery.
99% of the time, no monitor signal received.

1% of the time, the monitor receives signal and it shows that the boot
sequence halts at "Initialize Plug and Play devices"

So, how should I narrow down the troubleshooting?

http://www.elephantboycomputers.com/page2.html#Hardware_Tshoot

Standard caveat: Testing hardware failures often involves swapping out
suspected parts with known-good parts. If you can't do the testing
yourself and/or are uncomfortable opening your computer, take the
machine to a professional computer repair shop (not your local
equivalent of BigStoreUSA). Have all your data backed up before you take
the machine into a shop.


Malke