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Gigabyte p55a-ud3 wont run

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Anonymous
a b V Motherboard
August 29, 2010 3:47:16 AM

I've run out of ideas and was hoping someone here could help out. I purchased these parts for a new system.

gigabyte p55a-ud3
intel i7 860
kingston ddr3 2gb 1.7v x2
antec 850 power supply
radeon hd 5770 video card
1tb wd black drive

I've installed everything and turned the power on, it stays on for less than a second and then powers down, waits a couple of seconds and repeats the whole thing over again.

I have literally changed everything with the same results, I returned the MB for a new one, returned the cpu for a new one, purchased new memory, changed video cards, and changed power supplies and cases and I still get the same problem.

I've checked the power supply and its putting out the proper voltage.

I don't get any beeps when it starts up.

All 4 lights on the MB light up when it starts, the cpu and case fan both come on then it shuts off.

I can't think of anything else to try.

Does anyone have any ideas?

Todd
a c 156 V Motherboard
August 29, 2010 4:20:51 AM

Systematic troubleshooting and breadboarding to eliminate possible problems caused by your case:

Work through our standard checklist and troubleshooting thread:
http://www.tomshardware.com/forum/261145-31-read-postin...
I mean work through, not just read over it.

Breadboard - that will eliminate any kind of case problem you might have.
http://www.tomshardware.com/forum/262730-31-breadboardi...

Breadboard with just motherboard, CPU & HSF, case speaker, and PSU. You do have a case speaker installed, right? If not, you really, really need one. If your case or motherboard didn't come with a system speaker, you can buy one here:
http://www.cwc-group.com/casp.html

You can turn on the PC by momentarily shorting the two pins that the case power switch goes to.

You should hear a series of long, single beeps indicating memory problems.
Silence indicates a problem with (in most likely order) the PSU, motherboard, or
CPU. Remember, at this time, you do not have a graphics card installed so the load on your PSU will be reduced.

If no beeps:
At this point, you can sort of check the PSU. Try to borrow a known good PSU. If you cannot do that, use a DMM to measure the voltages. Measure between the colored wires and either chassis ground or the black wires. Yellow wires should be 12 volts. Red wires: +5 volts, orange wires: +3.3 volts, blue wire : -12 volts, violet wire: 5 volts always on. Tolerances are +/- 5% except for the -12 volts which is +/- 10%.

The gray wire is really important. It should go from 0 to +5 volts when you turn the PSU on with the case switch. CPU needs this signal to boot.

You can turn on the PSU by completely disconnecting the PSU and using a paperclip or jumper wire to short the green wire to one of the neighboring black wires.
http://www.youtube.com/watch?v=5FWXgQSokF4&feature=yout...

This checks the PSU under no load conditions, so it is not completely reliable. But if
it can not pass this, it is dead. Then repeat the checks with the PSU plugged into the computer to put a load on the PSU.

If the system beeps:
If it looks like the PSU is good, install a memory stick. Boot. Beep pattern should
change to one long and several short beeps indicating a missing graphics card. Silence or long single beeps indicate a problem with the memory.

Insert the video card and connect any necessary PCIe power connectors. Boot. At this point, the system should POST successfully (a single short beep). Notice that you do not need keyboard, mouse, monitor, or drives to successfully POST.

Now start connecting the rest of the devices starting with the monitor, then keyboard and mouse, then the rest of the devices, testing after each step. It's possible that you can pass the POST with a defective video card. The POST routines can only check the video interface. It cannot check the internal parts of the video card.
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