A week and a 1/2 ago, I received my replacement motherboard from Newegg. I originally had the 1st version of the Gigabyte P67A-UD7 and now it's swapped out with the B3 version. My system was a dual-boot system consisting of Win Xp Pro and Win7 Ultimate configured on a RAID10 setup. Before swapping out the boards, I had gone into the Intel RAID setup through the BIOS, and converted my hard drives back to NO-RAID. I had setup my RAID and OS's exactly like I had on the original setup before with the exception of updating Firefox. I had Firefox 3.16 on the old setup and after installing the New board, Firefox 4.0 came out and I upgraded. Am not sure if Firefox was or is the problem but here's my issue. On the Win Xp Pro, side of things, I had no issues with any part of my system being stable, NOW, on the Win 7 side, I had a major issue that almost replicates that of the old IRQ problems. I would start up Firefox 4.0 and no sooner then 5 minutes pass, my system became unresponsive, ie, mouse jerkiness, screen freezes delayed system responds to mouse or ending system tasks. I couldn't even get to the Task Manager and the only way to get out of this problem was to press the reset button on my case. Anyone have any suggestions as to what might be the problem ?