Why is the computer not working?

Question

Iron

The situation is this. Decided to clean up my computer. Everything was fine. I removed the cover, removed the dust, plugged everything back in - the fans are working, but the monitors are not. That is, the computer turned on, but there is no image on the monitors. I thought on the video card, it is old, but strong. Took it out, put it back in, nothing. I noticed that the red lights are on the ZE Debug LED on the motherboard, boot and gpu. When I was cleaning the computer, I removed the side fan to clean it, turned on and off the power button on the PSU several times. I do not know what to do, the situation is incomprehensible. Help, please, with advice, the computer is new, exactly one year old, good hardware, good PSU for 1000w

Answer 1

Try taking out the RAM, clean the contacts with an eraser (do not forget to brush off the remnants of it) and insert the memory back

Answer 2

How exactly did you clean the system unit? If with compressed air from the compressor, condensate from the compressor tank could get there and you won’t even see it (for example, in the legs of microcontrollers), and moisture mixed with dust could create short circuits on the contacts. The same thing can happen during brushing. Dust itself accumulates moisture from the room, and when brushing, the dust could be compacted into hard-to-reach places and become a "jumper".