Ok guys let me clear ur doubts. My motherboard is Intel DG33FB. I have Intel Celeron E1200, Intel Core 2 Duo E8400, Intel Quad-Core Q6600 and Intel Pentium Dual-Core E6600. All the CPU is working perfectly on this mobo but this E6600 only causing strange problems. Example when i restart the system , there is no display after shutting down. Sometimes i switch on the pc, there is no display. It occurs everytime about 80%. I have press off button and again on the pc. Sometimes again i on the problem is still there. I need to off and on many times until the display appears. This problem also occurs in Gigabyte GA-P35-DS3L motherboard. But this motherboard very rare creates this display problem. Bigfellla said my RAM and PSU is garbage. But how other CPU works fine. Even i have used that PSU for my Intel i7 3930k LGA 2011 socket. So i put some pictures of my system.