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My CPU powers up but doesnt appear to post or anything

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October 2, 2010 3:17:40 AM

I recently started having some PC problems. It started a with my computer running a little bit slower. Recently it got to where the computer would not boot up at all. Now when I turn the machine on, everything seems to turn on as usual but the monitor doesnt come out of sleep and it doesnt appear to go through post. Also all the lights on the mobo turn on and the hard drive sounds and feels like it is trying to send the data over. When i troubleshot it everything pointed to the cpu being bad. I sent it back in to AMD and it was in fact bad. They replaced the cpu and when I put it in, the same problem has prevailed through. If there is anyone out there that could help me out with what it could be I would greatly appreciate it. I am no expert but I have had some schooling in IT. My system build is a MSI 790FX-GD70 mobo; CPU is AMD|PH II X4 965 3.4Ghz; MEM is 2Gx3|OCZ OCZ3G1600; Video Cards are a NVIDIA 250GTS & NVIDIA 9800GTX in SLI; the power supply is a APEVIA WARLOCK POWER ATX-WA900W 900W ATX12V / EPS12V. Thanks and I appreciate any help i can get.

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October 2, 2010 3:48:56 AM

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.

And a last note: Apevia is not known for great, or even average P{SU's.
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