Computer screen blinking on and off
July 29, 2010 12:40 AM Subscribe
My secondary PC screen is blinking on and off when certain events occur.
posted by Harald74 to computers & internet (6 answers total) 3 users marked this as a favorite
OK, so I cannibalised an older PC here at work to get a graphics card with dual DVI out. The previous one was a gForce-based one with one DVI and one VGA output. I removed all nVidia drivers and applications, and installed the correct drivers for the "new" card, which is a Club3D Radeon X1300PRO 256MB CGAX-HP136. I grabbed the drivers and extras from ATI's site and installed them.
I got my new setup with two screens to work perfectly from the start, but with 1280x1024 @ 75 Hz resolution. As soon as I switched to the native display resolution of 1600x1200, which the graphics card could run at only 60 Hz, the secondary display started blinking on and off at approx 1 Hz. I procured a third screen of the same kind (HP LP2065) to try out, and checked and switched cables, but the problem persisted. A Google search turned up someone who had a similar problem which was cured by killing the "ATI Hotkey Poller" service in XP. For me this fix stopped the incessant blinking, but the screen still blinks off for a split second about every minute or so.
And there's one more sympton: When I move a Windows Explorer window unto the secondary screen, and that windows is either bigger than about half the screen area, or I enlarge it to that size while it's on the secondary screen, the scrren also goes black. Shrinking the window back below the threshold gives me my screen back.
I run Windows XP SP2, which is mandated by my workplace, so I can't really change that. But I'm open to other suggestions.