Hercules 3D Prophet II GTS Pro 64 MB problem

[Heraldo]

I have a problem with a Hercules 3D Prophet II GTS Pro 64 MB. I bought it second-handed for 25$ but there's a problem. I get these artifacts when I start up my pc. It's probably because it's overclocked by the previous owner. Is there any way to fix this?

 

[Maximus Nickus]

WELCOME TO THE FORUMS! [CO] LOR=blue

Overclocking is only active in windows, so if it happens as soon as you turn it on then I'm afraid he's busted it. Sold you a piece of s***.
He's most probably damaged the traces by prying the HSF off with a screwdriver.