Hey I just came upon this great forum. A few months back, while I was building my computer, a few things came up. I chose my parts, bought them and hoped to get my first rig going. Stuck it all in, Corsair DDR2 800 (PC2 6400) 5-5-5-18 RAM in the slots of the GIGABYTE-P35-DS3L board. When I booted, it started up fine, heard the little beep. However, the keyboard is not recognized. I tried PS2, USB, nothing worked. I had a Razer Copperhead, and I could tell the mouse was working because the lights were on. The Keyboard accepted no commands, even though the F-LOCK light was on. Every once in a while, I could POST by holding down "Delete", but did not get past the POST screen. This became a real nuisance, and without and leads, I randomly stuck a pair of Kingston 667 RAM in. Upon doing this, it worked perfectly! I used this opportunity to turn up the Voltage (default was 1.8, Corsair uses 1.9), played around with the clocks to 800 to match the corsair. Nothing worked. From this, I just gave up and stuck with the Kingston. I returned the Corsair RAM, asked Gigabyte and the RAM guy at Corsair without too much luck. This is passed already, I'm just wondering if anyone else encountered this problem, or can suggest some solutions, as I am considering buying some new RAM or upgrading to 4GB on Vista soon. Thanks!