My friend's PC is a 1.6ghz Intel Pentium 4. Recently he has problems powering it on. We changed the motherboard to a new Asus P4PE-X/TE with 256mb of DDRam(his old motherboard has SDRAM). However, when we switch on the PC, it starts to have a quick beep which sounds more like an ambulance siren. I took out all the cards and cables and it still has that ambulance beep. My question, is there different variants of Pentium 4 1.6ghz? Is the new motherboard compatible? If so, what is causing the siren? Could the beep mean something is wrong with the 1.6ghz CPU?