New System - No video on boot

Hey everyone,
I'm a frequent reader, but I've never posted before. I've built quite a few computers, but I've run into an issue today.

When starting the PC, there is no video. The computer also will not shut down unless I turn off the power supply on the back. I've ruled out the GFX card, but everything else is fair game.

AMD FX 8120
ASRock 970 Extreme4
500 GB Seagate
8GB of Corsair XMS 3
600W Inland ATX Power Supply (Microcenter brand)
Diamond HD 6770

Another thing is that the GFX card fan runs 100% when booted.

I'm stumped and don't know what to do.
11 answers Last reply
More about system video boot
  1. all the wires are connected on the board and the gpu card
  2. check to make sure the cpu is seated properly. If you have a speaker connected you should hear it post. if you don't hear it post it's not really 'turning on'
  3. Yep. I unplugged everything and redid it all over twice.
  4. The speaker is attached, but there are no beeps or anything. Like I said, I have no idea what's wrong...
  5. seen on the net someone with same motherboard and issue he upgrade the chipset driver on gigabyte an fix this
  6. So he replaced the board with a gigabyte mobo?
  7. mistake on the maker but try to apply the fix from asrock for the motherboard
  8. What fix? I can't find anything online...

    Could it be the PSU?
  9. First, the motherboard may need a BIOS update to work with the FX chip. In that case you will need a compatible AMD chip to flash the motherboard BIOS.

    Second, check this thread to make sure you did not overlook something simple:
    Build it yourself:

    Third, work systematically through our standard checklist and troubleshooting thread:
    I mean work through, not just read over it. We spent a lot of time on this. It should find most of the problems.

    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.

    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 (standby power supply): 5 volts always on. The green wire should also have 5 volts on it. It should go to 0 volts when you press the case power button (this is also a good way to test the power switch and the associated wiring), then back to 5 volts when you release the case power switch. Tolerances are +/- 5% except for the -12 volts which is +/- 10%.

    The green wire should be 5 volts whenever the PSU is plugged in and the PSU switch is on. It will drop to about 0 volts when the case switch is pressed and go back to 5 volts after it is released.

    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.

    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 (unless you have on board graphics available). In that case, remove any card and connect the monitor cable to the motherboard connector.
    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.
  10. Thanks for all the help.

    I'm not really sure what I did to get it working, but it works now and is running really well.

    Thanks again everyone!
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