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Mouse not working on COM3 Irq5

After installing Win NT 4.0 my Logitech Mouse is not working on COM3 IRQ5 Setup recognizes a Logitech mouse but I can't move the mousepointer. Anybody got a clue to solve it.
The COM port is working fine since it works perfectly in OS/2

On COM1 and COM2 are modems so I can't attach the mouse to another port. There isn't a hardware conflict.

I hope somebody knows the answer.

Thanks, Peter
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1 Solution
1) If you're letting a PnP bios define the com3 settings, hard set them in the bios

2) in CPL | ports, define com 3 as using IRQ 5

3) are you sure you don't have a sound card on IRQ 5? NT is less forgiving about that kind of thing than, say, Win95.

if those don't work, try moving one of your modems to com 3 IRQ5 and put the mouse on com1/irq4 or com2/irq3.

peterlindemanAuthor Commented:
1) It's not a bios problem. It's an jumpered IO card so PNP can't be the problem. Irq 5 is available.
2) In Ports I setted the correct settings, doesn't work either.
3) I'm absolutely sure that Irq 5 is available, in OS/2 the mouse works perfect.
4) COM3 is a 8250 UART, this one can't be used for highspeed modems, COM1 and COM2 are 16550 UART, I need those for my modems.

Any other suggestions ?
Do you have any errors in the system event log related to serial?

look in winmsd.exe on the 'resources' tab for the i/o and IRQ of the port. See if a) its there, and b) there's nothing else showing up on either one.

Look in Control Panel | devices and see what the start type and current state are for:
mouse class driver

try starting sermouse, see what happens.....

I have had 2 NT server systems that I had a modem on com3 for months. Then it would quit working on day. I don't have the error anymore but me and Tech data tried for hours to get it going again with no luck. I stick to 2 com ports now. I would put in a BUS mouse.

peterlindemanAuthor Commented:
NT won't work with it. I now remember why I'm not a MS fan. I deleted NT may be some other time. Thanks for answers!
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