help

Hello everyone i have problem with GPU my friend gave me EVGA GTX 670 fans and everything is spinning but has no display when i turn pc on it make 4 beeps 1 long beep and 3 short beeps already searched this code up and its gpu error but i have no idea what it could caused this i inspected card...

I’m looking for a list of books to help me get ready for starting my own cellphone/computer repair business if anyone has any suggestions for technical books I should add to my library about computer or cellphone repair. or even maybe some online classes I could take to help me get a better...