Guys, today I agreed to clean my cousin's PC. It was a regular clean which I've been doing on my PC for years - took off the side cases, used a vacuum cleaner and a microfiber cloth for removing the dust. The only electrical component that I had to disconnect was the case fan, nothing more. So after finishing with the cleaning, we started the PC. Unfortunately, nothing had appeared on the screen (the fans were working). I thought that I probably disconnected something while cleaning so I checked the condition inside the case in case a reseating was needed. However, everything was fine. After some unsuccessful tests and readjustments I decided to start the PC with the onboard GPU. Everything seemed to be fine, windows booted without problem (Note that the external GPU has been connected to the mobo all the time). Of course, that highly decreased the number of the possible culprits but so far I haven't managed to find the actual one. I'll be grateful for any suggestions and/or solutions. Thanks in advance!
Specs:
RAM: 4GB DDR3 Kingston
CPU: Intel Pentium G840, 2.8GHz, 3MB Cache
GPU: ATi Radeon HD7750
HDD: WD Caviar Blue 500GB, 7200rpm I guess
PSU: 550W
Specs:
RAM: 4GB DDR3 Kingston
CPU: Intel Pentium G840, 2.8GHz, 3MB Cache
GPU: ATi Radeon HD7750
HDD: WD Caviar Blue 500GB, 7200rpm I guess
PSU: 550W