Hi, I am using an HP Pavilion dv600 with the following: AMD Turion 64, dual core processor 2 GB DDR2 memory15.4″ WXGA High-Definition HP BrightView Widescreen Display (1280 x 800)256MB NVIDIA(R) GeForce(R) Go 7200160GB 5400RPM SATA Hard DriveLightScribe SuperMulti 8X DVD+/-RW with Double Layer Support1.3 Megapixel Webcam with mic built into screenAltec Lansing speakers built in3 USB ports, ExpressCard/54 Slot, Video Out, Integrated Consumer IR, 1 RJ-11, 1 RJ-45Windows Vista Home PremiumI have been running this notebook for a year and a half, but since about 3 months ago I started having a problem. Every time I turn on the computer and enter my password to load my desktop, the screen goes black right before making the switch from the password screen to the desktop. Ad it stays that way for about a minute. This also happens when windows asks me confirmation for security purposes. Right before the screen pops up the confirmation box (with the background being kind of faded) it turns black and stays that way for a minute. It always turned black, but never for more than a few seconds (2 - 3). It appears to me that every time there is a screen transition, this happens. I appreciate any help. Thank you.