computer not working

[thisissparta]

I have an old Pentium 4 PC that I wanted to use as a Linux machine.
It has a Transcend 512 MB DDR400 DIMM RAM module, and I purchased the RAM module just a year ago, so I dont really think it could be the problem.
Then there's a Seagate Barracude 7200 RPM 80 GB Ultra ATA drive.
And the motherboards an Intel D101GGC.
It has been a few months since I last used it, but just yesterday, I started it, and then, the moment I plugged it into the wall socket, the PSU turned on along with the CPU fan, but there was no beep. Earlier, whenever it would turn on, there would be a beep, a single beep, for about a second, but this time, there was nothing, and the monitor also did not turn on, like, it remained in standby.
I tried shorting the PSU with the green and black technique, and the PSU turned on.
I haven't tried anything else yet, but what could it possibly be? I need help here.
And I do know I posted it in the wrong section, but I did not find anywhere else where this would fit.

 

[MaCCx]

It could be your motherboard or your CPU that happened to my old emachine so I bought a new power supply and it still didn't work then I replaced the ram and still didn't work and finally turned out it was my motherboard.
What you can try is to move the ram in a different slot and if that dosent work it is probably your motherboard or your CPU.

 

[ihog]

What version of Linux?

 

[thisissparta]

I was considering tinycore linux or a minified version of debian.
I am doing some more tests like RAM in different slot and cpu unplugged, and will report the results soon

 

[thisissparta]

I just reset the cmos jumper, the cmos battery was out for around 26 hours, and with no RAM or HDD, there is a bit of a different result, earlier, the computer would start automatically, now I need to press the power button, no beep yet, and also, once started, I can only turn it off by disconnecting it from the wall socket or turning the socket switch off.

 

[thisissparta]

With RAM in one slot, same old response, power button required, no beep, once on, no way to turn off, but when I put it into the second slot, it again starts up automatically like before, but no beep again.