Cmos erors

ive just completly rebuilt my pc ie new motherboard/psu/cpu/ram when i boot it up i get a double beep and that is it. the boot screen displays all components and how much memory is installed. at the bottom it say CMOS Checksum Bad/CMOS Time And Date Not set/Press F1 To Enter Setup. after setting the time and date and selecting default setting/save and exit all i get is a blue screen ive tried all the Usual even tried booting up with motherboard out of tower all the same my motherboard is a elitegroup GF8100VM-M5/Processor amd dual processor 7450 can any body help thanx

hi nocheese ive contacted the retailer and they are going to replace the mobo as their tech support say that the mobo is faulty so thanx for taking the effort to try to help. cheers nocheese keep up the good work