Compressed Air

We gently sprayed compressed air around the fans and parts first before spraying the contact cleaner following instructions on the can.

I recommend getting a can of compressed air or an electronics duster.

compressed air is your friend here, just do it outside or somewhere you don't mind dirt clouds. hold the fans in place while blasting so they don't spin (can damage bearings), and take your time getting into the heatsinks and gpu fins.

Compressed air would probably do it, maybe take it outside so you're not blowing dirt around your home, lol.

Don’t use brushes to clean PCBs, use compressed air. You can get it canned.

you can try blowing the ram slot with compressed air, its weird that it just stopped working like that, make sure the system is unplugged and turned off when doing so