System will not boot, no post or video output.

I am working on a computer for a friend, it is a compaq presario SR2170NX.

1 gig ddr2 memory
3.0ghz pentium 4 631 processor
integrated video
300w bestec psu

When the system is powered on the fans run very slow and there is no video output. I also get no post beep at all. I hooked up another PSU (350w dell that i keep around for testing) and got the same results. When I pull the ram stick I get post error beeps for the ram missing but when i replace it it goes back to no beeps and no video.

i read the no boot/ no video output guide and it says that situation means the ram is shorting out the psu which it states is are but does not say if its a bad ram stick or problems with the ram slots on mobo etc. Any help would be much appreciated.
4 answers Last reply
More about system boot post video output
  1. I don't wanna be rude but.....
    Your system might be just dead or partly dead.
    P4? Just get a new system.
    P4 isn't even worth it anymore to be repaired.
    Save your time from the trouble shooting effort.
  2. guanyu210379 said:
    I don't wanna be rude but.....
    Your system might be just dead or partly dead.
    P4? Just get a new system.
    P4 isn't even worth it anymore to be repaired.
    Save your time from the trouble shooting effort.

    The person who owns the system is not in a financial situation to afford a whole new computer, I wanted to build them a new rig from the start.
  3. OK.
    There is also another possibility about the culprit.
    If you have tried to unplug the RAM, no post could also because of the damaged GPU.
    Since the GPU is onboard, this means, your mobo is also damaged either partly (only the GPU) or totally.

    The other possibility (since you have mentioned that the fan is turning so slow), the PSU could also be dead, and perhaps it has taken also the whole system with it to hell.

    Please also check the monitor, perhaps the monitor is the one which has died.

    It is now not that easy to find a mobo, RAM , or Proc replacement, the best chances you got is the e-bay.
    Finding a PSU is however very easy.

    It will takes weeks until you found the culprit and get the replacements, and I am still haven't talked anything about the price.
    Those components may be old but on the other hand not easy to find, which could give enough reason for relatively high price.

    I say, spare about USD300-500 and get a low profiled PC instead of repairing.

    You can keep the case, HDD, DVD-ROM, Monitor, Keyboard
    , Mouse, Speaker, and Win XP (or Linux).
    You would probably only gonna need a proc, mobo (onboard sound & GPU), RAM, and PSU.
  4. 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.
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