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No signal after installing new graphics card

Last response: in Graphics & Displays
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June 26, 2011 7:27:44 PM

Hello, I recently built a computer with the following specs. Asus M4A88TD-v Evo/USB3 motherboard, AMD Anthalon quad core processor, 700 watt apevia power supply, 6 gigs of PNY ram, 500 g seagate hard drive. I installed windows 7, installed the drivers and for about two weeks everything worked flawlessly. About two days ago I got my Asus radeon hd 6850 graphics card in the mail, I installed it into the proper PCI slot, plugged in both 2X3 power cables and tried to boot it up. All the fans started going (including the one on the graphics card) but my display said no signal even though I had plugged the HDMI cable into the new graphics card. I tried plugging it into the motherboard and it says no signal still. I removed the graphics card and still no signal so I can't even access BIOS. I have tried resetting the ram, taking every piece out and putting it back in, tried a different monitor, different cable, everything seems to run fine but the screen still says no signal. The power supply is more than enough to power the card so I am stumped. I feel like the graphics card isn't damaged due to the superb packaging but even if it was why can't I get signal from my motherboard? If it disabled the on-board graphics I should still be able to access BIOS. Please...help me. Your time and responses is greatly appreciated.
a b U Graphics card
June 26, 2011 7:58:29 PM

Take the card out of the PC and then look if you can get a signal from the integrated graphics. If so, your card and/or motherboard (PCI-E slot) is broken. If you still don't get a signal then your motherboard is broken (of course it's then still technically possible your card is broken as well, but that would be a major coincidence).
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June 26, 2011 10:43:57 PM

Thank you for your suggestion. I have tried plugging my HDMI cable into the motherboard with and without the graphics card in and the motherboard gives me no signal. I'm hoping it is just the motherboard then, too late to send it back though :( .
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June 27, 2011 4:49:58 AM

Try resetting motherboard bios, pull power & take battery out of mother board for 20 sec or clear cmos, then try again
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a b U Graphics card
June 27, 2011 4:53:34 AM

Shut down your system and move the reset CMOS jumper pins to the reset location for 30 seconds or longer then remove your BIOS battery as well. Give it about 5 minutes (overkill but positively reset) and then replace the battery and the CMOS jumper pins and then reboot.

You should get a signal and be able to go into your settings and reconfigure. If you don't get a signal you can try to connect by VGA or DVI if you have that option to see if you can get a signal from the motherboard.

If not of that works, it sounds like you have a hardware issue...
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a b U Graphics card
a c 156 V Motherboard
June 27, 2011 1:20:45 PM

Apevia power suplies are not the best, not even average, if the world. The extra load of the video card could have caused the PSU to fail.

Try breadboarding the system.

The following is an expansion of my troubleshooting tips in the breadboarding link in the "Cannot boot" thread.

I have tested the following beep patterns on Gigabyte, eVGA, and ECS motherboards. Other BIOS' may be different, but they all use a single short beep for a successful POST.

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 once you are finished.

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...

A way that might be easier is to use the main power plug. Working from the back of the plug where the wires come out, use a bare paperclip to short between the green wire and one of the neighboring black wires. That will do the same thing with an installed PSU. It is also an easy way to bypass a questionable case power switch.

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, long single beeps, or series of short beeps indicate a problem with the memory. If you get short beeps verify that the memory is in the appropriate motherboard slots.

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.
At this point, if the system doesn't work, it's either the video card or an inadequate PSU. Or rarely - the motherboard's PCIe interface.

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 U Graphics card
June 27, 2011 3:56:49 PM

Lol, I hope you copied and pasted that from a previous issue JSC. Great info and spot on with the advice. Great work bro... =D
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June 27, 2011 10:12:42 PM

Best answer selected by dfarkas.
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a c 271 U Graphics card
a b V Motherboard
July 20, 2012 12:36:10 PM

This topic has been closed by Mousemonkey
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