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Help please!

Last response: in Graphics & Displays
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October 31, 2011 12:48:42 AM

I have a prebuilt I was looking to upgrade but found that to quickly be a big mistake... I have a GeForce GTX 580, Corsair TX750 PSU, M4N68T-M V2 motherboard, and an AMD Phenom II x4 840 as my main components. The only issue is that I can't get any picture. At first, I was thinking its the graphics card but I just recently "unbnet" the pins on my CPU after installing it wrong but when I turn the computer on, it works fine. The other thing is my graphics card doesn't fit the case properly and the tab of the graphics card is caught on the case so it won't seat fully. I'm thinking its the main issue but specifically, the shorter side of the graphics card pins are shown, about half a millimeter. Is this the reason that I most likely don't have display or something else I'm missing? Thanks!

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a c 1401 U Graphics card
October 31, 2011 1:01:12 AM

Prebuilt and you where installing the CPU? If you installed the Motherboard yourself did you use standoffs?
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October 31, 2011 1:03:46 AM

Actually, I don't remember why I took out the CPU but it originally came installed when I got it prebuilt. I got a replacement motherboard because my old one was defective but there's those risen holes on the case that work as standoffs. Everything else on it works except video.
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a c 1401 U Graphics card
October 31, 2011 1:06:13 AM

You plugged in the external power to the card from the PSU and hooked the video cable to the card itself not the motherboard?
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October 31, 2011 1:09:15 AM

Yes, it requires a 6 pin and an 8 pin, my PSU has two 6+2 pins so I used those. Yes as well, I tried both because apparently my motherboard has onboard video, neither worked.
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a c 1401 U Graphics card
October 31, 2011 1:14:12 AM

The onboard should disable with the discrete card in the PCIe slot but should work if you do not have the card in. If it does then we can safely say it is a problem with the card both being nvidia should display on the same drivers.
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October 31, 2011 1:20:41 AM

I've tried it as well when the card wasn't installed. It's weird, it was brand new when I got it.
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a c 1401 U Graphics card
October 31, 2011 1:25:12 AM

So it does not work without the card after you re bent the pins?
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October 31, 2011 1:28:18 AM

Everything else works, just not video. I tried to "unbend" the pins as best I could on the CPU and I figure its alright since everything else works the way it's supposed to.
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a c 1401 U Graphics card
October 31, 2011 1:39:43 AM

How can you tell if you have no picture on the monitor?
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a c 1401 U Graphics card
October 31, 2011 1:49:56 AM

No signal means that there is nothing coming from the computer to the monitor, it is a monitor message and does not come from the computer itself. You have not mentioned any beebs so I am presuming there is no case speaker installed and that the computer is not finishing post which can be bad CPU or bad motherboard. Last try without the card using the onboard, with the power off pull the motherboard battery out for a few seconds to reset BIOS, if it still does not display then the wrong insertion damaged both or one or the other!
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October 31, 2011 1:55:49 AM

The computer has an onboard speaker, there are no beeps, and does not start/successfully finish POST. The issue is I don't have much of a way to diagnose the issue since I don't have a power LED indicator to diagnose the problem. I just got the replacement motherboard so I doubt its that. Like I said, I've tried it with just the onboard video and still got the same message.
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a c 1401 U Graphics card
October 31, 2011 2:04:04 AM

Does the CPU fan spin up? If so then it is starting but not posting which points back to the bent pins.
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October 31, 2011 2:07:16 AM

Yes, it spins, the case fans spin, even the graphics card fan spins...
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a c 1401 U Graphics card
October 31, 2011 2:09:53 AM

I would suspect the CPU first! Unless you got a bad new board!
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October 31, 2011 2:19:44 AM

I doubt its the board, its from CyberPower (although manufacturered by Asus)
and they supposedly test their products before sending them out. I figured it was the processor as well but don't feel like spending the $100 when I don't even know if thats truly why I have no video....
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a b U Graphics card
October 31, 2011 2:23:40 AM

No beeps means the system is not doing anything.


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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October 31, 2011 2:32:58 AM

And yet fans are spinning and shows signs of power...
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a c 1401 U Graphics card
October 31, 2011 3:05:42 AM

squilly827 said:
And yet fans are spinning and shows signs of power...

Your best bet is to follow jsc's breadboarding to find the culprit. The case speaker is important.
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October 31, 2011 10:21:40 AM

I installed the case speaker but didn't hear anything.
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a c 1401 U Graphics card
October 31, 2011 5:32:14 PM

If it is not beeping when hardware is missing, like ram, then most likely it is the motherboard that is bad.
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October 31, 2011 6:04:12 PM

There's no hardware missing. Case itself, CPU, heatsink, CPU fan, hard drive, motherboard, disk drive, RAM, and everything from the front panel.
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a c 1401 U Graphics card
October 31, 2011 7:20:16 PM

Pull out the ram "Breadboarding" if it beeps then the motherboard is OK. If you want to find the culprit follow the breadboarding!
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October 31, 2011 7:25:11 PM

So just pull out the RAM and see what happens... both sticks or just one? I doubt thats the culprit to no video though.....
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a c 1401 U Graphics card
October 31, 2011 7:32:31 PM

Both sticks on startup the system should beep if no ram present, basically means motherboard is detecting equipment missing which is a good sign for it.
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November 6, 2011 11:10:06 PM

I have beeps but an error message. One beep followed by three quick beeps. It's AMI BIOS and apparently there's over current issues and no keyboard detected messages.
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!