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How do I know if I have motherboard issues or a CPU problem?

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November 24, 2010 7:28:49 PM

I get my pc parts today, and install everything and power it up. The light and fan on the PSU turn on, it fires up, the cpu fan powers up, the GPU powers up, and the harddrive powers up. the only issue if that when i push the button to power up my monitor, it doesn't work. the light turns green (normal when on) then turns yellow/orange and is a blank screen.
I built a pc in the past, so I know what I'm doing, but I am really stumped on this, someone please help.
a c 141 à CPUs
a c 212 V Motherboard
November 24, 2010 7:43:13 PM

Could be the GPU actually. Is the system beeping at all when it starts? If you have integrated video or another GPU you can swap, give that a try to see if your results change. Remember, new doesn't mean it works. Good luck!
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November 24, 2010 7:46:23 PM

Has your board got a 12v aux plug and is it connected.
Is your graphics pci-e? Does it need a pci-e psu supply and is it plugged in?
If your card has 2 outputs have you tried them both?

Do you get a post beep?
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November 24, 2010 7:48:25 PM

COLGeek said:
Could be the GPU actually. Is the system beeping at all when it starts? If you have integrated video or another GPU you can swap, give that a try to see if your results change. Remember, new doesn't mean it works. Good luck!

There is no beeping, I can try it out with another. It doesn't work with mt 8400GS either. I tried the ram, 1 stick in and tried the other. I am really stumped to what this could be.
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November 24, 2010 7:54:20 PM

beanoslim said:
Has your board got a 12v aux plug and is it connected.
Is your graphics pci-e? Does it need a pci-e psu supply and is it plugged in?
If your card has 2 outputs have you tried them both?

Do you get a post beep?

No beeps, the graphics card is PCI-E 2.0 x16, it is a PCI-E psu, but the gfx card doesn't have anywhere to plug it in. I have also tried using the vga and dvi ports on the motherboard alone, also doesn't work.
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November 24, 2010 7:59:41 PM

Whats your mobo and does it have a 4 pin/8 pin 12v ATX plug?

Have you tried resetting the bios including removing the bios battery for 15 mins.
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November 24, 2010 8:32:09 PM

beanoslim said:
Whats your mobo and does it have a 4 pin/8 pin 12v ATX plug?

Have you tried resetting the bios including removing the bios battery for 15 mins.


My motherboard is an MSI G41M-P25 and I removed the Bios battery for 30 minutes, and it still does not work.
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November 24, 2010 8:39:38 PM

beanoslim said:
Whats your mobo and does it have a 4 pin/8 pin 12v ATX plug?

Have you tried resetting the bios including removing the bios battery for 15 mins.


How do I reset the BIOS? and when i power my pc up the monitor says "VGA No Signal" then turns off with the orange color as I said before.
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a c 156 V Motherboard
November 24, 2010 8:54:06 PM

Unfortunately, the only way to reliably test a motherboard or CPU outside of a production environment is by substituting known good parts.

Troubleshooting:
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 beeps 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. 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.

Motherboard LED's mean very little. When on, all they are telling you is that the computer os plugged into a live power socket and the PSU is switched.

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 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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a b V Motherboard
November 24, 2010 9:01:51 PM

As well as removing the battery you need to switch the JBAT1 jumper switch over.

A pic of your mobo and the cmos clear instructions are in the manual.
http://www.msi.com/index.php?func=downloadfile&dno=1143...

The mobo does have a 4 pin ATX plug, have you def got this connected?

Also what CPU are you using and is your bios up to date?
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November 24, 2010 9:17:25 PM

beanoslim said:
As well as removing the battery you need to switch the JBAT1 jumper switch over.

A pic of your mobo and the cmos clear instructions are in the manual.
http://www.msi.com/index.php?func=downloadfile&dno=1143...

The mobo does have a 4 pin ATX plug, have you def got this connected?

Also what CPU are you using and is your bios up to date?

Bios I do not know. I built this whole pc today. Stupid me, I didn't see the CPU Powercord, so I plugged that in. It ran for 4 seconds before it shut off. The light on the Mobo turned on, and it shut off and repeats. CPU problem? yes, it has a 4pin atx. just conected it and thts what I got. So, CPU issue?
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November 24, 2010 9:31:32 PM

Right, download the manual and do a bios reset. The jumper is next to the ide slot.
Remove the power cable, press your power button a few times, switch the jumper, remove the bios battery.
Leave it 15 mins, push battery back in, switch jumper back, power it on.

Only other thing I can say is I had a similar problem when I upgraded a e6600, it did exactly what your saying and the problem was the default bios wasn't up to date enough to support the cpu.

Thats way I asked what cpu you had. The only way I fixed mine was to get an older cpu to get the machine to boot so I could update the bios. Luckily I picked up an old celeron for £5.


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November 24, 2010 9:37:06 PM

beanoslim said:
Right, download the manual and do a bios reset. The jumper is next to the ide slot.
Remove the power cable, press your power button a few times, switch the jumper, remove the bios battery.
Leave it 15 mins, push battery back in, switch jumper back, power it on.

Only other thing I can say is I had a similar problem when I upgraded a e6600, it did exactly what your saying and the problem was the default bios wasn't up to date enough to support the cpu.

Thats way I asked what cpu you had. The only way I fixed mine was to get an older cpu to get the machine to boot so I could update the bios. Luckily I picked up an old celeron for £5.


http://www.msi.com/index.php?func=downloaddetail&type=bios&maincat_no=1&prod_no=2014


I am running a Core 2 Quad 2.66GHz i tried it with my old Pentium Dual core and still nothing. It powers up for a few seconds, then turns off, then restarts and repeats and no picture on the screen. I will try the Bios deal and see what will help.
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November 24, 2010 9:47:54 PM

If you look at the pic above the bios jumper is along the bottom, its the small turquoise jumper next to ide1.

The core 2 quad 2.66 should run off the original v.S0 bios so shouldn't be that.

Try the bios reset it may have got itself in a muddle.

Good luck.
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November 24, 2010 9:51:16 PM

beanoslim said:
Right, download the manual and do a bios reset. The jumper is next to the ide slot.
Remove the power cable, press your power button a few times, switch the jumper, remove the bios battery.
Leave it 15 mins, push battery back in, switch jumper back, power it on.

Only other thing I can say is I had a similar problem when I upgraded a e6600, it did exactly what your saying and the problem was the default bios wasn't up to date enough to support the cpu.

Thats way I asked what cpu you had. The only way I fixed mine was to get an older cpu to get the machine to boot so I could update the bios. Luckily I picked up an old celeron for £5.


http://www.msi.com/uploads/5_pictures/five_pictures1_20100427160153.jpg


YES!!!! IT WORKS!!!! THANK YOU SO MUCH!!!
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a b V Motherboard
November 24, 2010 9:52:25 PM

Nice 1.. [:bohleyk:1]
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January 13, 2014 10:41:10 AM

Thanks for posting this Question.

If you had installed single RAM:
---------------------------------------------
1.Remove your RAM
2.Clean the RAM pins with a dry cotton or with an eraser.
3.Insert the RAM again in your RAM Socket.


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