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black screen startup

By RG11 ·
not sure what was done to the machine previously. When I turn the machine on everything sounds fine the hard drive is spinning but I am not getting a signal to the monitor. I am thinking it may be the video card or mother board. I took out all other cards and tried unplugged cd rom. still nothing. When I put a startup disk in, I get the same black screen and the 3 1/2 isnt lighting up but I am not sure if the bios is set to boot to 3 1/2 first. The monitor is fine. The numlock or cap lock on the keyboard will not respond either. Any suggestions on what to do next.

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black screen startup

by parvus1202 In reply to black screen startup

If you checked the monitor cord, and it's fine, and all you have said, that you checked everything and they're fine, then get another monitor to test your computer or another computer to test your monitor. For now that is what you can do. We can't be sure unless you know exactly which one is not working.

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black screen startup

by RG11 In reply to black screen startup

I havent checked the video card but I know the monitor is fine. I am going to swap out the video card and check that.

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black screen startup

by richard_barsby In reply to black screen startup

Hi the PC is not even getting to post by the sound of it try to reset the CMOS with either jumpers or remove battery for 20 Minutes.

Rich

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black screen startup

by RG11 In reply to black screen startup

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black screen startup

by TheChas In reply to black screen startup

Things to check:

Inspect the motherboard for signs of overstress.
Burnt, charred, or "bloated" components.

Reset CMOS memory.
Verify the jumper is not in reset position.

Verify drive connector polarity.

Verify that AGP card is fully seated in the socket. It does not need to be up by much (0.01") to cause problems.

Try a PCI video card.

Remove and reseat RAM modules.

Try Known good ram.

If practicle, check motherboard regulator voltages.

Check 5v and 12V on drive connectors.

Swap CPU.

If these all yield no results, then I would say the motherboard is bad.

Chas

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black screen startup

by RG11 In reply to black screen startup

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black screen startup

by reefurbb In reply to black screen startup

pc needs minimum to boot to BIOS:
1. power supply on...connected...pwr switch ok. See if the pwr LED lights up. See if pwr supply fan runs.
2. motherboard. AT pwr supply runs to an attached switch direct. ATX pwr supply runs switch wires to the MOBO. Did they fall off or etc.?
3. RAM. if it went bad or is loose... Usually the MOBO will beep at you.
4. Usually, the cpu cooling fan will not run if something is wrong. If it runs, RAM-mobo-etc. is ok.
5. except that the mobo may be bad. Then,some things run but no video-etc. If BIOS screen doesn't appear, you can't boot from floppy.
6. you should list your system: PC, mobo, ram, OS,etc. to see if you have a new or old one. SOME old mobo's won't BIOS unless a good HDD is present.
7. Some stupid proprietary mobo's won't show bios (early Compaq). As soon as you turn on your PC, hold down the DEL key and see if your PC beeps you about a stuck keyboard...

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black screen startup

by RG11 In reply to black screen startup

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black screen startup

by RCOM In reply to black screen startup

You didn't mention how you tested the monitor, this is too simple but is brightness or contrast turned down?

I agree that resetting the BIOS may correct peoblem. Someone may have changed a setting that is stopping the computer from coming up.
Does the computer beep at all. Usually there's at least one beep when MB testing finishes.

To add to what Chas stated, on the original design AGP cards had a tendency to ride up in the back of the slot and lose conectivity.

To see if the floppy is working at all put the ribbon cable on backwards and the indicator light should stay on continously, this won't hurt the drive.

Reseat CPU, video card and memory. If needed you can clean the contacts with a pencil eraser.

You didn't mention it, but is this a slot or socket CPU. I've had problems with slot PIIs going bad.

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black screen startup

by RG11 In reply to black screen startup

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