So I decided to buy a new graphic card to fully enjoy my PC games. Once I set it up it sounded like the fans were working too hard,so I decided to open the computer case and clean inside.

And now it doesn't boot anymore. Nothing at all on the screens.

I don't know what I did, only the fans are turning when I press the power button. Even the led on the front of the case is not blinking anymore.
I have enjoyed my new graphic card during one hour all in all. Frustration is high.

Remove components one by one yo find which one broke.

I've had the same behavior with broken cpu in the past when my friend's pc fell off my sofa.

Yeah I disconnected all the sata disks and the graphic card (using the motherboard's dvi output to test the display), still the same :-/
The vaccum cleaner hypothesis is possible but I live in a nordic country, not sure if it applies as dry...
@TheKarlisk Not sure I understand your 2nd hypothesis : I did use the new graphic card during an hour. The cpu was at 70° which is warm indeed, but if that was the issue then wouldn't the computer have crashed at that moment rather than not boot? For your last suggestion wouldn't I see a console error on the screen still?

Put the dust back in :D

do a cmos reset. and power it up without the graphics card. post your result

out of curiosity, which card did you get?

@WildOrangutan Genius! I went to the local playground and dug my computer into the sand. Well it still doesn't boot but now there's a crackling sound when the fans rotate and the smell makes me feel like I'm on holidays in Marrakech

@JhonDoe Yep, did that already, still zero display. The graphic card is a GeForce GTX 1650 Super. Nothing too fancy but much better benchmarks than my old one

The only thing happening apart from the fans rotating is the disk usage led switching on for a fraction of a second, then nothing lights up anymore

remove every sticks of ram except one.
if it boots, put other sticks in.

it worked on many computers for me in simmilar situations.