System shows no display but boots.

My system recently froze when it booted up Windows XP to the desktop. The mouse and keyboard didn't respond so i restarted the system with the reset button. Now it won't show any display and the monitor says No signal when it boots. The system sounds like it boots up normally. No BIOS post screen show up.

P5GC-MX ASUS motherboard
Intel Dual Core Processor E2140 @ 1.6Ghz
Intel Integrated Media Acceleration 950 VGA Onboard
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More about system shows display boots
  1. Do a BIOS reset and see if it works. Mention your PSU.

    Do you hear any beeps when you start your PC?
  2. If you don't hear a single, short beep, you are not booting.

    Work 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.

    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.

    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.

    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 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.
    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.
  3. hell_storm2004 said:
    Do a BIOS reset and see if it works. Mention your PSU.

    Do you hear any beeps when you start your PC?

    Unfortunately my motherboard did not come with a system speaker. However, normally on boot the system will create a rattling kind of noise if it is properly working. It is making this sound. The system is using a 450W PSU as it does not have any other cards in any of the slots.

    I will do a BIOS reset tomorrow when I have the time.
  4. I did a BIOS reset with no luck. However, I found out the problem through the tests. It was the integrated graphics accelerator. It did not show any display because of what I suspect to be bad drivers. I used my old 8500 GT to boot into Windows and removed the drivers. Removed my card and reboot. The integrated graphics worked again and the system boots fine. I reinstalled the drivers and seems to be functioning perfectly now.
  5. If BIOS post screen does not show up, then this means Windows drivers are not involved as BIOS post screen has nothing to do with Windows drivers.

    The problem could be monitor connection failure. As you replaced the VGA card with a spare one, you removed VGA cable and reconnected. This should have resolved your issue.
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