Are you getting any messages when the pc boots up?  Sounds like it's booting to the signon screen.  A standard wired mouse, not wireless, with USB plug?  Keyboard is plugged into correct hole - it will also fit the mouse hole but will not work.  Some BIOS have a setting to activate USB ports - go into setup while booting to verify that they are turned on.
Do you have another mouse (borrow for a few minutes from a friend, neighbor or school?) you could try?
Unplug the mouse and plug into a different usb port if available.  You may here a 'ding' sound and windows may popup a screen 'new hardware detected',  depending on windows version.   
----- Original Message -----
From: Thomas Mayer 
Date: Tuesday, April 11, 2006 1:34 pm
Subject: Re: [PCBUILD] Mouse and keyboard stopped working
To: [log in to unmask]

> Does the keyboard also work on the laptop? Were the mouse and 
> keyboard 
> connected to the desktop via USB or PS2? Is the reason you can't 
> not 
> load Windows (what OS ?) beyond the log in page because you can 
> not type 
> in a password or is it possibly some other reason? Can you open 
> in Safe 
> Mode?
> 
> Both the keyboard and mouse likely came with adapter(s) to 
> connect to 
> the computer using either USB or PS2. Try connecting them 
> differently 
> than when the problem started.
> 
> If you get them working and/or Windows loads (safe mode?), go to 
> Device 
> Manager (control panel/system/hardware/device manager) and see 
> if there 
> is any indication of problems. If there is/are, uninstall that 
> device(s) 
> and back out of control panel and restart the computer. The 
> problem 
> device(s) should be reinstalled and you can check it/them again 
> with 
> device manager. If needed and you at least get the keyboard 
> working, you 
> can navigate using tab and arrow keys.
> 
> Let us know your results for our edification or further 
> assistance. I 
> hope this information helps.
> 
> Tom Mayer
> 
> Stephen R Stanfield wrote:
> > Hello All; My mouse and keyboard stopped working. I am 
> using laptop 
> > to send this post. The mouse works through USB port on laptop, 
> but not 
> > on PC. The PC will boot to log on page, but am unable to 
> navigate 
> > further. Any suggestions?
> >
> > thanx in advance
> > stephen r stanfield
> >
> > PCBUILD maintains hundreds of useful files for download
> > visit our download web page at:
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> >
> 
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> Bob Wright
> Drew Dunn
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