I was using 2x2GB 1066mhz ram on my laptop. But recetly purchased 2 Corsair 4gb ddr3 1600mhz rams. BIOS shows 8GB but only at 800mhz. The problem is that it doesnt boot into Windows 7 after this it keeps on rebooting to the Dell Logo page. Tried all diagnostic memory tests and it was all fine. Tried Hynix 2x4GB 1333Mhz ram it was working fine but had to replace it due to frequent bluescreen errors. Why isnt Corsair not booting into Windows 7? Pls help me.