ok well i was watching netflix on my hp slimline s3400f w/ upgraded gpu and psu (6450 gpu and 300w psu) then all of the sudden the computer turned ioff all the fans started to not work. So im thinking maybe its my gpu so i plug my VGA cord into the mobo graphics (nvidia 6150se) which that didnt work. But now whenever i turn on the computer some fan is running really hard (i dont know which one im guessing the amd 6450 gpu fan but im not sure) Could it be the motherboard thats not working.Im not getting picture on my monitor not even for the start up for the computer could it be overheated? i turn off the computer everynight and its normally on from 3:50pm to 10:00pm unless during the weekend which i dont know how late i stay up 12+. The computer turned off at 4:50pm so it wasn't even on for that longshould i let it rest? Or should i open it up and take the amd 6450 out? i really dont know what too do. please help