I upgraded my memory from Kingston ValueRAM 2GB (1GB x 2) 667MHz DDR2 Non-ECC CL5 DIMM (Kit of 2) to Corsair XMS2 TWIN2X2048-6400C4 Matched Pairs 2GB kit (2x1GB) PC6400 DDR2-800 CL 4-4-4-12 240-pin Dual Channel Memory today. The computer was fine before, but now it won't boot. After pressing the start button, the computer just beeps(long)-beeps(short)-beeps(short). My motherboard is ASUS M2N-E, and it should support DDR2-800 memory. Anybody has an idea of why?