hai guys...help me sort out...bought a new mobo asus p5g41c m-lx,i installed a corsair xms2 2gb ddr2 800mhz ram(recently rma'd hence new) but the system wont boot....tried with my old 2*1gb ddr2 667mhz ram,system works an everythin is fine...is there a prob with my rma'd ram....using new psu,no...