The PSU was working, but i didn't touch the contacts. i moved some parts inside (HD) and i think that i merelly touched the inserted RAM.
Anyway, maybe even the turning off and on of the computer did that, since that is what happened the first time i bought the new RAM, a few mounths ago and now again. i took out and stuck back in the RAM modules, even used the old ones and only one time it recognized.
It's like a machine barely working, and even when you touch something-it breaks.
Why should be the PSU closed for some time before starting again, which capacitors should i check, the mother-board's? and how?
I got a suggestion, from an other forum, to take the CMOS's battery out and put back in order to reset the CMOS. curiously, i did that twice-and in both times the computer worked afterwards (it didn't after i sut doun and started again, a few times, after the first CMOS's refresh, and it worked immediatelly after the second CMOS's refresh)