Removable Storage USB is Switching off Graphics Card

When I plug a removable storage device into a USB port the grahics card switches off and I have to reboot my PC.  My BIOS firmware is up to date, all drivers are up to date, the PC is still running, other USB devices are plugged in and fine, and it doesn't matter if the removable storage is independently powered or not.
I have checked motherboard set-up and anti-virus but cannot find anything obvious.  My Graphics card is a Radeon 9200 in the AGP slot.
I am running XP professional with Avast anti-virus and the internet comes through a Netgear 834 Modem to a Belkin wireless unit both have firewalls active.  Windows firewall is off.
This is getting very frustrating.
nigelldAsked:
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CallandorCommented:
Your removable storage disk may be drawing too much power, or the USB port cannot provide enought current - each USB port is supposed to be rated for 5v @ 500mA.  You can try a powered USB hub or a different USB port, and see if that fixes the problem.
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thamarajCommented:
do you mean monitor goes blank?
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nigelldAuthor Commented:
Hi thanks
The monitor is still on as it displays a 'No Signal Input' message.
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thamarajCommented:
when you start your pc can you able to see the bios?
please check the VGA card insert properly or not.
waiting for your reply..
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nigelldAuthor Commented:
The whole PC works perfectly until I decide to plug in a removable storage disk then the cards switches off.
Yes I can see the BIOS and the PC looks at the AGP slot first at boot up.  Card is seated properly.
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nigelldAuthor Commented:
Thanks Callandor, can you help with my understanding.
I understood that if the USB device was powered it didn't make any difference to the port?  the 2 drives I'm trying to connect have independent power so why should it overload the USB?
Thanks again
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thamarajCommented:
please uninstall video drive first then try again.
let me know the status....
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CallandorCommented:
In a perfect world, powered USB devices would work independently of the USB port, but if the motherboard has a defective USB circuit, plugging in a device can trigger a crash or shutdown.  The motherboard driver may also be at fault, so I would try an independently booting system, such as Knoppix, which has its own drivers.
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nigelldAuthor Commented:
Hi Callandor,
Thanks for that, I can see where you are coming from.  Two last things, will the amount of PCI slots used also effect the power drain to the system.  I ask as I have several slots with cards in that I don't use and wondered if I took them out would I be able to plug in the USB succesfully.  AND Would a larger PSU solve the power problem, I'm running a 450w at the moment.  Sorry I  didn't understand the Knoppix thing.
Nigel
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CallandorCommented:
Yes, cards in slots use power, whether you do anything with them or not.  The USB circuit is separate, so unless you are right on the edge in power requirements, I don't think freeing up the slots will provide more power to the USB ports.  A more powerful PSU would only help if the current one is on the edge or defective; the problem could be circuits on the motherboard.

Booting with Knoppix would eliminate software as a cause, since it doesn't use the same drivers and can't be infected with malware.
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