New Build Won't Boot for First Time

[smartazjb0y]

So this is the first time I've built a computer and it didn't go so well. The components are: i3-2120, XFX R7770, Crucial 2x2GB DDR3 RAM, Antec vp-450 PSU, and an H61M-p20 mobo.

So after building it and attaching everything, with the PSU set to 115V, I turned it on and the case LED flashed, and the CPU and GPU fans would spin for a second, then turn off. I asked for help from some people and since my PSU was used they suggested that was the problem. I bought a new Antec VP-450 and same problem, so I switched it to 225V and the computer would actually turn on: the CPU and GPU fans would spin and stay on, I could open the optical drive, and there were lots of sounds. When I connected my monitor to my GPU, though, there was no signal.

So I took things out. I only have 1 stick of RAM, the CPU and CPU fan, the power 24pin and the front panel stuff (Reset Switch, Power Switch, HDD LED and Power LED) connected. I connected my monitor to the DVI slot on the mobo and turned it on, the computer still turned on and stayed on (PSU still set to 225V) but still no signal to the monitor.

I've also removed and reinstalled the CMOS.

People have said either I have faulty RAM (I tried using both sticks 1 at a time) or a faulty CPU. Any other help?

[chaud]

If you are in the US, it should be on the 115V setting. Set it correctly, build outside of the case on the motherboard box or something non conductive, trying again. Is there any beep code?

There are two PSU connections on the motherboard, you only mentioned one.

[smartazjb0y]

Yeah, it's just weird that the computer won't stay on when the PSU is set to 115V (I'm in the US) but it does stay on when it's set to 220V. I'll try taking things out of the case, but do I still leave the front panel connections in?

And the 20-pin and 4-pin connection are right next to each other on the mobo, so although the PSU cable has the 4pin and 20pin cables seperate, there's a little hook that attaches them into essentially 1 cable that fits into the one mobo connection.

[Deleted]

I remember that when I built my computer I attached one cable to the wrong slot and it wouldn't boot. But as soon as I swapped the place the computer booted.

[n0cturnal]

Yeah, it's just weird that the computer won't stay on when the PSU is set to 115V (I'm in the US) but it does stay on when it's set to 220V. I'll try taking things out of the case, but do I still leave the front panel connections in?

And the 20-pin and 4-pin connection are right next to each other on the mobo, so although the PSU cable has the 4pin and 20pin cables seperate, there's a little hook that attaches them into essentially 1 cable that fits into the one mobo connection.

There should be a separate 4pin cable aswell... which most likely should be placed on the opposite side of the CPU.

http://images.highspeedbackbone.net/...or_2520615.jpg

The 4pin ATX connector at the top next to the RAM slots.

[smartazjb0y]

OH MY GOD THERE WAS SECOND PSU CONNECTION ON THE MOTHERBOARD.

AHHHHHH thanks so much guys! I feel so dumb but so relieved.

[Deleted]

I'm hijacking this as i have a simular problem, I cant boot my comp from the on off button for some reason. I have to press it repeatedly then yank out the power cord then plug it in again in order for it to boot. Any ideas on why this is happening? Also if i dont press the power button it doesnt help if I pull out the cord, it wont start unless i go through that damn ritual over and over again :P

[chaud]

I'm hijacking this as i have a simular problem, I cant boot my comp from the on off button for some reason. I have to press it repeatedly then yank out the power cord then plug it in again in order for it to boot. Any ideas on why this is happening? Also if i dont press the power button it doesnt help if I pull out the cord, it wont start unless i go through that damn ritual over and over again :P

That sounds like your PSU is on the way to its death, usually from old age or being really cheap. Try replacing it.