I got this morning and moved the mouse to de-activate the blank screen saver. What came up was a screen filled with alternating black and yellow-green veritcal lines. The card was not oc'd at the time and I was using the 8.70 catalyst beta on my Windows 7 x64 build. After rebooting it came up normal. Is this likely to be a driver issue or something wrong with the card? It is a new card. It is definitely not a heat issue.