Hello. I have a problem with my pc. Today i was sitting on pc on youtube. suddenly my pc shuts down itself and then start but "No signal" error appears on my monitor. Even my monitor won`t start by itself, i have to press the power button on it. The fans on my graphic card work fine, everything is clean, no dust. Is the graphic card broken or what? The cables are ok i checked both ends of it. This error( NO SIGNAL) appeared sometimes when my pc was coming out of hibernation but after a restart was all fine.