No video input

October 14, 2008 at 07:21:57
Specs: windows xp sp2, Athlon 3000+/1gbram (2 51


I am having issues with my video. Most of the time when I start my pc the monitor displays a no video input message. My MB output LED displays that a normal boot has been achieved. All fans are running fine. This problem doesn´t occur always, sometimes I am able to boot properly and use the pc. Once started, it stays on for days without presenting any problem, but at next reboot it usually presents the problem again. This randomness is quite intriguing.

I have a ABIT AV8 MB, and ATI Radeon 9800 pro . I have had the pc for some time and the problem started only recently.

What can be wrong?


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October 14, 2008 at 09:56:49

If it only fails to boot when the system has been turned off for a while and is cool, the most likely cause is a flaky connection somewhere on the motherboard. Heat causes materials to expand and cooling causes contraction. This can affect connections.

If you normally get a single beep when it boots up ok and don't get the beep when it fails, that means the motherboard isn't operating.

If it's a desktop, you could try removing the AC plug from the wall and reseating the motherboard power connector a few times. Corrosion of the connectors can cause them to become flaky.

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October 14, 2008 at 10:19:55

Or it could be your PSU is failing.

Also try re-seating the video card too.

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October 14, 2008 at 11:24:04

Hi, and thanks for answering.

Whether the system is cool or not seems to make no difference, as it has worked and failed both warmed/cooled. I have tried re-seating power connectors, both on PSU and on motherboard, the system still won´t power up.

As for beeps, I have been unable to power up the system again today, I haven´t really noticed if it beeps when it works, but it definetely does not beep when it fails. The motherboard output displays the boot sequence went fine, does that mean anything, or the mb may be not operational even though the output says otherwise?

About PSU, I will try to get another one to test later, but shouldn´t disabling hard disks and other stuff help in that case? Or shouldn´t it fail after some time of computer use, if it were faulty? I have tried disabling every non-essential stuff and the monitor still does not get signal.


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Related Solutions

October 14, 2008 at 11:36:36

"The motherboard output displays the boot sequence went fine, does that mean anything"

Are you saying you get a display screen when you first start up and then it goes black when starting Windows?

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October 14, 2008 at 11:48:27

No, I mean there is a led display on the motherboard, with output codes. It goes all the way through normal codes and ends at the boot up sequence, the same thing that happens when the pc actually works ( i.e. get signal in the monitor ).


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October 14, 2008 at 11:55:37

Probably the graphics card then. I don't think there is much you could try to correct the problem.

No specific drivers are used for POST screens so if you don't even see them then it most likely is not software (driver) related.

Did you try re-seating the card. Don't just press it in. Remove and replace several times to scrub off any corrosion. Sometimes different metals are used in the contacts. This can cause corrosion, which is resistance.

Be sure to unplug the computer and exercise static precautions.

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October 14, 2008 at 12:32:02

You could also try reseating the cable going to the monitor.

Do you hear and see the hard drive accessing, like the system is booting up normally, and you just don't see anything on the monitor?

Check to find out if you get the single beep when it boots ok.

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October 14, 2008 at 13:51:17

I am trying, but it is not booting right now. The hard disk is powering up and running.


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October 14, 2008 at 15:13:30

Lets go back to square one.

Did the computer always act this way? If not, has it gradually gotten worse?

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October 14, 2008 at 15:27:31

Be aware that you don't need the hard drive to be working to get a display. All you need is a good power supply, a working motherboard, RAM and graphics adapter/monitor.

It makes it nice when a PC normally gives the initial post beep. You don't even need the RAM or video working to get a beep(s). Any beeps indicate that the motherboard and CPU are working (at least to some extent).

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October 14, 2008 at 17:15:08

I am aware of that. I have tried already to turn it on without the hd, even without ram, to no avail. Without ram the motherboard simply hangs at the ram load code. Lack of hard disk makes no difference.

There is no beep at all, to be honest i don´t recall it ever beeping, i don´t think it beeps at all.

The computer has worked fine for a year and a half, no problems. It started malfunctioning all of a sudden, a week ago. I am at a loss here.

I tried to let it run for some time without the video signal, and observed a new symptom. After 10 minutes or so it reboots itself, I don´t know why.


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October 14, 2008 at 18:06:46

Have you tried disconnecting everything from the motherboard except the RAM, graphics card and monitor?

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October 15, 2008 at 05:29:08

I have. I have tried to assemble it in cardboard too, video card ram and monitor only, to no avail. It is quite frustrating.


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October 15, 2008 at 07:52:11

I would suggest trying another graphics card.

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