Could you post a screenshot? Does turning off »Use Graphics Processor« in the Performance Preferences (Photoshop > Preferences > Performance > Graphic Processor Settings) and restarting Photoshop have any bearing on the issue?
Sounds like a bad graphic driver. Update the driver directly from AMD or NVIDIA. If that doesn't work, it may help if we could see your Photoshop System Info. Launch Photoshop, and select Help > System Info... and copy/paste the text in a reply.