Grey and black lines

Scraface

Honorable
Mar 13, 2013
1
0
10,510
Hi, I have a Z77 Pro3 motherboard, with a 8Gb of ram, when I try to change my video card to a Radeon HD 6670, once in a while the screen goes grey and dark in lines (| | | | | | | |) kinda. The only thing I can do to stop this is by hardreset my computer. It can't be the power supply, I have a 650W from a good brand, can't remember the name but cost me over 100 bucks. Tried all the patches and stuff from catalyst, still, it does it at very random times while I'm playing.
Any kind of help would be greatly appreciated.

Thank you!