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Internal modem stops monitor working

By lynz67 ·
I built a my computer in October last year and have installed the full version of XP Home OS (Service Packs inclusive). I have not used an upgrade version and until now there have been no issues with this machine.

Three days ago I fdisked my machine to remove XP Pro (no Service Packs) and installed XP Home and I bought an external modem at this time. I used to use a SwannSmart IIx 56K V.92 internal modem but now have a Netcomm 56K V.92 USB external modem. I am able to unistall the internal modem without any problem however once I remove this internal modem from the PCI slot the monitor doesn't work until I put the modem back in the slot.

It seems to me that the internal modem has been identified as a graphics card and I am at a loss as how to fix this issue considering that located in the AGP slot on my motherboard is a Radeon 256MB graphics card.

My computer spec's are as follows:
2.8GHz Intel Celeron Processor
Asus motherboard with 533MHz FSB
512MB SDRam
256MB Radeon Graphics card
2 x HDD (1x40GB and 1x80GB) both IDE
2 x Burners (1xCDRW and 1xDVD Dual Layer burner)
Antec system case with front and rear fans

I have checked the computer's IRQ and BIOS configuration but nothing stands out as being wrong. No error messages are being generated and according to system information and DR Hardware 2005 v6.0 there are no conflicts to resolve.

I would really like to resolve this issue and remove the internal modem but I don't know where to start or what to look for.

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by TheChas In reply to

For my money, the experiment points to a problem with the motherboard itself.

The only other idea I have is to use a bright light and magnification to inspect both the PCI and AGP slots.

What you are looking for is a damaged part of one of the fingers inside the connector that is bent in such a manner that it connects to the finger across from it.

If you do find one, here is what is happening:
The bent finger is shorting 2 signal lines together. This locks up the data bus and stops the PC from POSTing.

Just thought of 1 final idea that I should have added to my original answer.

Boot up with a POST card in the PCI slot farthest away from the slot where you have been installing the modem.

Assuming the unit fails to POST, the POST card should tell you where in the POST sequence the system halted.

Chas

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by TheChas In reply to

Depending on how old your motherboard is, I would contact ASUS and see if you can get it serviced under warranty.

If you are extremely curious as to where the POST stops and why it is stopping, a POST card is the answer.

Here is a link to a reasonably priced POST card:

http://www.geeks.com/details.asp?invtid=SY-TECHAID&cat=CAS

One last thought:
This is again a manufacturing defect. For some reason, the BIOS is looking for an on-board modem.
Getting no response from the modem controller locks the POST.
To the BIOS, a modem and a sound card look very similar.

Chas

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by TheChas In reply to

Come to think of it, do you have the latest BIOS?

Check with ASUS for a BIOS update.

Set the system up to boot from a floppy, and flash the BIOS.

Then, see if you can boot without the modem.

Chas

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by willcomp In reply to Internal modem stops moni ...

Your case fans should be connected to power supply via molex plugs (I'm familiar with the case). Still won't hurt to disconnect just in case.

Of Chas's postulations, the one that seems most logical is modem completing ground when installed.

But don't rule anything out, no matter how remote.

Suggestion to try another card is so good and so obvious I'm wondering where my brain was.

Dalton

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by willcomp In reply to

The further this goes, the more it appears that a PCI card is completing mobo ground to case.

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by lynz67 In reply to Internal modem stops moni ...

To Jessie
I went and bought a sound card just for this excerise. I get visual dispaly with any PCI card is in any of the slots, donesn't have to be the internal modem in that particular slot and up until now the internal modem was the only PCI card I had. So it is no restricted to just the 1 PCI slot,its all 4 of them.

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by lynz67 In reply to Internal modem stops moni ...

To Jessie
I went and bought a sound card just for this excerise. I get visual dispaly with any PCI card is in any of the slots, donesn't have to be the internal modem in that particular slot and up until now the internal modem was the only PCI card I had. So it is no restricted to just the 1 PCI slot,its all 4 of them.

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by lynz67 In reply to Internal modem stops moni ...

TheChas
I went & bought a new sound card for the exercise. Started machine today with internal modem in & got visual from monitor, took out internal modem & low and behold I got a visual display from monitor. I thought it had corrected itself so to be sure I turned the machine off again & restarted it & suprise, surprise, no visual display from the monitor. Put the sound card into another PCI slot & restarted computer & got a visual display from monitor. Took the sound card out & no visual display from the monitor.

I have checked every power lead and connector from the power supply again, checked every IDE cable again, checked every external cord and power lead again and no visible signs of damage.

Took out internal PCI card and changed AGP cards & the result was the same - no visual display from the monitor until I put a PCI card back in then I got a visual display from the monitor.

Took motherboard out of the case a & sat it on the desk, then started the machine with the same result - no visual display from the monitor unless something is in a PCI slot.

I have disconnected all internal case fans - same result. I disconnected the burners one at a time - same result. I connected the secondary HDD because until now it has been disconnected with the same result - only have visual display from monitor if something is in a PCI slot.

Power supply change gave me the same result. I have gone over the system case and can't see any issues with the case.

I have tried 3 different monitors and use 3 different keyboards & mice - same result.

What are the chances of a computer learning to fly? I'm at the point where I could throw it out the window & then jump on it a few times just for good measure. Might not do much for the machine but it would make me feel a whole lot better.

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by User94327 In reply to Internal modem stops moni ...

Put the a PCI card back in, boot up, and get into the BIOS. Look under all the settings for something like 'Init Display First'. You'll have two options, PCI or AGP. If it already says AGP then forget it, this answer won't help. If it doesn't say AGP, change it to AGP and save and exit. Turn off the computer and remove the PCI card. See if you have video. I ran into the same type of problem and this worked for me. I had no display when removing a PCI card, and it wasn't a PCI video card. I hope it works for you.

Greg

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by lynz67 In reply to Internal modem stops moni ...

Thanks for the input guys and girls.

I rang Altech Pty Ltd where I bought the motherboard from and told them that they can deal with it because nothing that I have done or that you guys have suggested has corrected the issue yet, although it has ruled a few things out.

The motherboard will be sent back to Altech on Monday morning, I won't close this question until I have a definite answer from Altech as to the reliability of the motherboard.

I'll keep you posted as to the outcome from Altech. So when I know, you'll know, for future reference.

Again thank you.

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