I contain an ASRock N68C-S UCC. I pay money for a package and it worked very well. Then I realized that the CPU is supplied with a single-core Athlon (AMD Athlon 64 2650e - ADG2650IAV4DP) Instead of dual core was announced. The seller sent me a replacement CPU.) My process was to boot the PC into the BIOS settings Select Default BIOS settings, save settings, click Shut Down. Replaced the CPU for the new. On and I get nothing. The board is alive - the fans are running and the CPU is hot, but there is no signal going to the screen (integrated graphics). If the first CPU to change back, it boots fine. Did I miss something or I have sent a dead CPU.