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October 14, 2010 12:11:36 PM

Hello,I have a scrap built desktop here for which I've bought an appropriate MOBO for everything is supported however it will not post or give beeps. I've tried the following hardware variations:

MoBo = G41TM-E43 (works with P4 3.2Ghz 800FSB duel core)
CPU for build = Q9300 2.5Ghz 1333FSB 6Mb cache
PSU = Antech Eathwatts 430W M/N EA430
tested memory modules(1 stick of each):

- OCZ2VU8002G PC2-6400 2Gb 800mhz
- Patriot PC2-5600 512Mb 533/700Mhz
- Patriot PC2-5300 1Gb 667Mhz
- Corsair VS512MB533D2

All of these give me only fan and light function with no post or boot up beep and no video I did however notice that some components near the +12 ATX connector were getting REALLY warm.

Any responces on this issue will be greatly appreciated, and Thank you in advance!
a b B Homebuilt system
October 14, 2010 3:48:51 PM

Is it a new MB? If not, check the capicitors on the MB.
Do you know if you're PSU was working before?

If you take out the all the memory, it should beep because it's trying to POST.
If you don't even get that, then there's something else wrong.

I would check to make sure there wasn't a short on the board. Are you using standoffs? Any dust in the way?
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October 14, 2010 10:32:01 PM

Good idea ill go check the standoffs i may of left an extra one in there from the other board. yes the PSU(USED, WORKS) and MB(NEW) work i used them with a lower end P4 and all was good, it seems the CPU may be bad, I guess well see.
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October 14, 2010 10:43:11 PM

just check all standoffs are used and in place and removing memory has same result (no POST) TY for your help still at square one :p 
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a b B Homebuilt system
October 15, 2010 1:06:59 AM

Just on the off chance if you have a USB device that is attached to the PC and has its own power source unplug it. Unplug the power cable to the PC and hit the on button so that the Motherboard is completely clear of power.
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October 15, 2010 7:38:53 PM

ive tried that also and even tried running it with only ram and the CPU installed and got nothing :/ 
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a b B Homebuilt system
October 15, 2010 9:45:33 PM

If you say it still works with the P4, then put the P4 in and try updating the BIOS to the most current. That motherboard might not recognize the 45nm CPUs. There's also a good chance that the CPU is dead.
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Best solution

a c 122 B Homebuilt system
October 16, 2010 6:26:30 AM

CPU's are surprisingly durable. CPU failures are pretty rare. Assuming correct assembly, my guess would be either PSU or motherboard.

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.

This will be a little different if you have integrated graphics.

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 23, 2010 8:48:15 PM

Best answer selected by THEBIGPOTPLANT.
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