[Solved] New build won't turn on, makes a zap sound; using a multimeter? Hi, I am building my first computer - it actually started out an upgrade of an old Compaq, but I had to get a new motherboard (got the ASUS M4A785TD-M EVO AM3 AMD 785G HDMI Micro ATX AMD Motherboard) when I found the new CPU (Phenom II) was not compatible. Basically the problem that I have is similar to what is described in [removed cause I'm a noob] ("New PC Build - PSU makes noise similar to a short 'zap'"). However, I'm not sure the zap sound is coming from the PSU. I have a 600W CoolMax PSU. Like the user in that thread (maXimus4444), I only get a zap once. The motherboard's LED light comes on when I plug in the computer, but when I press the power button there's just the zap and no other signs of power whatsoever. I have an old case, motherboard, and CPU that I can test some of the components on, and when I switch these components (PSU, hard-drive, dvd-drive, video card) back to the old motherboard and CPU, the computer boots up OK with no problems that I can see. I cannot test my new CPU on the old motherboard as it can't handle a Phenom II. I also can't test my old CPU on the new motherboard as it doesn't fit the AM3 socket. In that other thread, the person eventually said he resolved the problem and this is what he said caused the problem: I think he meant to say incorrectly. But I don't really know what that means. Does he mean like the power switch? I've looked at that again and again and it seems OK. Couple other things: I found out that my CPU had some bent pins and I bent them back. I haven't noticed any electrostatic discharge but I haven't been taking as much precaution as I probably should. I have about two weeks left to return the items. Also, I'd like to learn how to use a multimeter to diagnose problems with a computer. I read [removed cause I'm a noob] at Tom's Hardware ("Do I have a dead motherboard? No beep, no BIOS screen.") and there was a user there (westom) who swore by multimeters for diagnosing problems, but it's not really clear how people use these. I saw [removed cause I'm a noob] at Hardware Heaven ("testing your psu with a multimeter"), but I'm pretty sure I know what my PSU will be saying: no power.