Problem using flash drives on USB ports

I'm having trouble getting my Dell Optiplex GX280 to recognize USB flash drives, even though it did work on one time.  Not sure what changed.  The USB ports recognize when I plug in a flash drive, but I get an error, see attachments.  The USB ports work fine for other devices, printers, etc.  I tried plugging in a powered USB hub, then plugging the flash drive into that, but no change.  See attached documents.  Tried multiple flash drives, same resuilt.
easybillAsked:
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easybillAuthor Commented:
I narrowed it down to a new HP color laser printer that was recently installed on that machine.  If I unplug the laser printer (USB), the flash drive(s) work fine.  If the laser printer is plugged in, I get the unknown device error on the flash drive(s).  At least there's a workaround. Any suggestions on that before I close this question?  
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theras2000Commented:
Attachments?
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easybillAuthor Commented:
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easybillAuthor Commented:
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easybillAuthor Commented:
PC is running Windows XP Pro.
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easybillAuthor Commented:
Not sure how those links will help me?  Linux?  Windows 7?  Should I download thd driver set from Dell for this Optiplex and reinstall the chipset drivers, etc.?
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dbruntonCommented:
The first link talks about disabling ACPI.  There may be an option for that in the BIOS.  Or try disabling Power Mangement in the Control Panel.
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easybillAuthor Commented:
Power management was already disabled, at least through Control Panel.  Couldn't find anything about ACPI in the BIOS.  I downloaded the latest BIOS and Chipset files from support.dell.com and installed them, but no change.  Ugh
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dbruntonCommented:
Interesting.

You've solved it yourself so you can close it as being solved by yourself.
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easybillAuthor Commented:
I stumbled upon the solution myself by unplugging other USB devices until I discovered the printer was the issue.  Not a permanent fix but will work for now.
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