I have just purchaced a new mobo ( ASROCK N68C-S-UCC ) with new processor ( 218212 AMD Sempron 145 2.8Ghz ) with 4Gb DDR3 1333Mhz of RAM.I have connected everything in the case as it should be but when I turn the computer on the mobo powers up ( CPU Fan runs, Hard drive seems to get power ) but monitor receives no signal so I cant get to the bios.I am using a 300W power supply. Can anybody suggest what I am doing wrong please.