I'm not new to PC building as i have been doing it for nearly 7 years, but i have a problem right now I'm unable to figure out and hopefully i can get some help as i am getting rather frustrated. So about 2 weeks ago my parents started up there computer and it would not Post, in fact it would only beep repeatedly forever, well i swung by and picked it up and tried to figure it out i tested all the parts in another computer to see if they worked everything checked out except for mobo and CPU as i didn't have the means to test those. Well i figured it was time for an upgrade for them anyway, so i ordered a new Mobo, CPU and Ram which arrived yesterday and after installing all of it into there case turned on the computer to find it still isn't posting but now instead of beeping, everything turns on, the fans will spin the lights turn on, but after 4seconds it shuts down, then it starts back up on it's own and then again after about 4 seconds it shuts down again, on, off, on, off and so on. I tried running with only the Mobo, CPU, Ram, and Vid card still nothing, i tried running it outside of the case and still nothing, (figured the case might of been shorting it) I reseated the Ram, and Processor, and video card several times reset the bios using the jumpers and removing the battery and nothing is working. Any Ideas or help would be great thanks.