New custom pc, turned off, won't turn on!?

December 10, 2010 at 14:08:04
Specs: Windows Vista

My friend helped me built a gaming desktop and it was fine for about a week...then suddenly it turned off, no warning whatsovever, the screen just went blank.

I was able to turn it back on again and it worked fine, until after a few hours it turned off again and won't turn back on again...

I bought a Colors-IT 750W Gold version power supply originally and thought that might have been the problem since it was so I bought a new a power supply hoping it would work while I get a refund for the CIT one.

However when I connected the new OCZ 700W Mod-z power supply it still won't turn on?

I tried doing this to turn it back on....

1. Plug the mains adapter to the power supply.
2. Switch the psu on. (I did this both ways...still won't turn on?)
3. Press the on switch on the case.
4. 4 LEDs turn on on the motherboard and the keyboard light turn on but only for a split second.
5. Press the on switch again, no lights at all.

These are the components:

1 x Gigabyte P55-USB3 Socket 1156 Intel P55 USB 3.0 ATX Intel Motherboard
1 x Sony 24x SATA Black DVD RAM-OEM
1 x G-Skill Ripjaws 4GB (2 x 2GB) DDR3 PC3 12800 1600MHz Memory
1 x KFA2 GeForce GTX 470 1280MB GDDR5 PCI-E 2.0 x 16 Graphics Card
1 x Samsung EcoGreen F2 1.5TB 5400rpm SATA Hard Drive
1 x Intel Core i5-760 Socket 1156 Quad-Core CPU Retail
1 x TP-Link TL-WN851N 300mbps

Provided I connected it all correctly.....what could be wrong...? >____<;;;;

Please ask me for more information if you require anything >__<;;

See More: New custom pc, turned off, wont turn on!?

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December 10, 2010 at 14:34:25
The "Colors-IT 750W" is a low end piece of sh!t, you got what you paid for. And why are you running a slow EcoGreen HDD on a gaming system? The EcoGreen is a storage drive.

Strip the system down to as barebones as you can go. Remove all the RAM but one stick. Disconnect ALL the drives, you don't need them for testing the board. Remove the wireless card. Unplug all external devices except the keyboard & monitor. Does your motherboard have a built-in speaker? If not, make sure you have the case speaker connected - the ability to hear the BIOS beep codes is extremely important. Do you have a less power hungry card that you can use temporarily?

If you only have the GTX 470, make sure it's fully seated in it's slot & both 6-pin PCIe plugs are connected to it. Double check that the 24-pin ATX plug is properly plugged into the board along with the 8-pin ATX12V plug. If you attempted any overclocking, use the clear CMOS jumper to reset the BIOS. Now try to bootup & access the BIOS using the keyboard.

Assuming you have a speaker connected, post back any beep codes. If no beeps are heard, you have a major problem.

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December 11, 2010 at 09:02:11
I suggest you follow the instructions given by mickliq.

You need to have the least number of unknowns to start your investigations.
So as a start only have the minimum hardware required to be able to boot your system.

Makes sure that you check all cables that they are fully pushed home and any memory cards are fully slotted in place.

Any hardware you add ensure that it is positively located in its slot.

If that works then steadily add other bits till you have identified the problem kit.

When everything else fails, read the instructions.

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