Could a warp motherboard become dead?

[Peroxyde]

Hi,

I am trying to fix an unstable computer since the last few days. I have posted in this forum various confusing questions. The problem is that when I power on, the screen is totally blank. I made all kinds of wrong diagnostics because each time I touched something, the board seems to boot and revert back to its troubles (no boot screen, blank monitor). So now I would like to ask you a few final questions before I call it quit.

1. On power on, the screen is totally blank. I heard repeatedly a long beep, pause 1 second, long beep, pause, etc. The Bios is Phoenix 6.0. From some searches, this seems to indicate a RAM issue. Yesterday I could boot the computer, ran some successful RAM test with MemTest86+. However, the computer was indeed unstable and often rebooted unexpectedly. Could a faulty RAM sometimes works, sometimes not like that?

This is a single 1 GB DDR2-533 RAM. I will try to borrow other RAMs to try later. For now I would like to know how how an "unstable" RAM module behave.

2. The only big change I made since yesterday is that I have changed the CPU cooler which has a different mounting system, using no back plate. May be it warped the board slightly. Could a light bend of the motherboard breaks something and renders the mobo non-operational?

Thanks you very much in advance for any help.

 

[Peroxyde]

ANSWER:
It was two issues:

1- Defective RAM module
2- Faulty IDE cable ribbon.

All issues disappeared after replacing these parts. I was unlucky those two decided to die at the same time. I did do some rubbing / cleaning to dust them but would not expect to kill them. Combined with lack of experience, I was totally lost by the erratic / random behavior of the computer.