USB mouse on Dell inspiron 3200

Hardware section does not have an area for laptop, so I have to post here. Sorry if seems not related.

I got an old Dell Inspiron 3200 laptop (with only one PS2 port) and want hook up external keyboard (PS2), and USB mouse(Microsoft Optical) so dont have to use the small keyboard and awkward touchpad.
Everywhere in Dell document just says just plug in and it should work, but it does not! The laptop just use the touchpad anyway, my USB optical mouse does not even light up!
Nowhere in BIOS has anything related to USB, I tried Win98, ME, and Win2k -- all the same, OS can see an "Unknown USB device" but cant do anything with it.

The mouse is good, works if plug to other PC, or convert to PS2 on this one.

Help?? Hints??
Thanks all.
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Did you install the MS software?
oldyellowcatAuthor Commented:
yes I did, no help. :(
Humm, does any USB device work on this computer?
I know you stated it seen a new USB device but couldn't do anything with it, so I am wondering if the port itself is maybe bad, or maybe a conflict with something else.
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oldyellowcatAuthor Commented:
Conflict..that's what I am thinking too, but could not find out what is conflicting ..
Unfortunately no other USB device to try at this time.
Enable the usb in the bios
oldyellowcatAuthor Commented:
I already said "No where in BIOS has anything related to USB"
I hate to say it like this but I see three choices here.
1. hook the mouse up to the PS2 port and don't worry about it.

2. Buy, borrow, or something to get a known good USB device to try to install.

3. take it to a shop or local expert who can troubleshoot this for you.

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look in device manager of system control panel for usb (it should be last - usb root hub). Delete it - that will force it to reinstall at next boot.
USB doesn't work at all in w95, only with extra add-on  usb drivers in 98/me. You have to be on w2k or wxp to really get a bang out of it.
You can also just get a ps/2 splitter from compusa: lets you plug a ps2 keybd & ps2 mouse into a single ps2 connector on a laptop. About $15.
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