Pc wont boot after booting successfully twice

Posted by schrome_@reddit | buildapc | View on Reddit | 2 comments

Upgraded a friends pc. He had a old hdd with the os on it. I had to activate CMS for it to boot successfully. I then powered the system down to set the ram to 3200. It didnt boot after that and showed: reboot and select proper boot device...

After pressing a button a few times it showed the same message but cut off It said: Reboot and select pro Then cut off and when i pressed a button nothing happened

After i reset the bios the same thing happened Please help I am at the end of my wits