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XFX 750i mobo won't stay on

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September 28, 2010 4:10:08 AM

Hi, but I don'y why the mother board will not stay on for more than a second or two and then shut right off, As the first time I turned it on it stayed on for about a min but I didn't get any video then when I tried turning it on again it stayed on for 3 secs and then shut off on its own not it won't even stay on for more than a sec.

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a b V Motherboard
September 28, 2010 4:51:41 AM

Primary suspects are cpu Heat Sink Fan not working, heat sink has come loose, or power supply failing failing . . .

Please tell us your PC's configuration.
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September 28, 2010 5:47:13 AM

XFX 750i mobo
Intel E5300 cpu /Stock fan
Kingston 2GB 667MHz memory
OCZ 60GB SSD Vertex
650w psu

And I changed the PSU / Memory And the CPU to see if it was the cause but it didn't help, no change it still shuts off right after I hit the power button...
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September 28, 2010 6:30:43 AM

Could be the motherboard that's bad if you've already checked the CPU, memory, and RAM.
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September 28, 2010 6:38:02 AM

Thought so but needed a second opinion as this is the second one that I bought from Geeks.com had to return the first as it wasn't giving me any video and now this think I'm gonna return this and just get the ASUS board Instead...
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a c 156 V Motherboard
September 28, 2010 2:18:15 PM

It may not be the motherboard. What brand of PSU?

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. We spent a lot of time on this. It should find most of the problems.

If not, continue.

I have tested the following beep patterns on Gigabyte, eVGA, and ECS motherboards. Other BIOS' may be different.

Breadboard - that will help isolate 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.

Make sure you plug the CPU power cable in. The system will not boot without it.

I always breadboard a new build. It takes only a few minutes, and you know you are putting good parts in the case.

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:
Running fans and drives and motherboard LED's do not necessarily indicate a good PSU. In the absence of a single short beep, they also do not indicate that the system is booting.

At this point, you can sort of check the PSU. Try to borrow a known good PSU of around 550 - 600 watts. That will power just about any system with a single GPU. 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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October 17, 2010 11:21:32 PM

Best answer selected by shmcphrsn.
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