It isn't very clear from your post what the issue is, but if your issue is that you simply can't enter the CTRL-M RAID configuration utility, then try reseating the RAID key (near system memory) and the riser card.  YOu could also try clearing the NVRAM using the jumpers on the motherboard.  
ok here it is,   about a week ago we tried to reformat poweredge 2800, i tried to find Configuration Utility instead we found out it was on iSCSi we so change configuration devices to raid restarted it and there Configuration Utility was out but i tried to enter the configuration utility ,and i didn't boot up on configuration utility instead it repeats on telling you to press ctrl-m to configuration utlity.  what im asking is now how can i solve this problem?has anyone encountered this problem? 
Poweredge 2800 cannot enter BIOS[f2,ctrl m, f10, f12]