I found the P67 Extreme 4 debug codes here http://www.scribd.com/doc/50174663/12/Dr-Debug Its not the same mobo but the codes should be the same. There doesnt appear to be a code 62, so its down to trial and error. Unplug everything (power and data cables) except what you need to get a display on the screen. That includes all USB devices as some can mess with booting. Reset the CMOS then set the voltage for memory correctly. Use a single memory stick, try different sticks and slots. If it posts successfully, work from there to find if anything was causing the fault. If still no luck, take the machine apart and rebuild it, give it a good clean.