What to do if there is no image although the PC and all peripherals work?

Question

Iron

It’s a strange story, the PC was buggy and Windows didn’t stratify normally, plus everything was 4GB and it showed only 3 out of 4. Well, I think I’ll clean the memory, take out the whole thing, wipe it from dust, I didn’t touch the contacts with anything, I put it back and there is no picture, already on two I checked the monica with different cables and there is no signal. history!)) I tried everything and VGA and HDMI distorted everything, removed
the battery, what could be the reason? two PCs do not display an image at once, for the first time I encounter this

Answer 1

Is there a squeaker on the PC?
There is a problem with the motherboard. That is, the PC does not work.
Wipe the contacts of the ram dies, blow the dust in the slots.