You may have a faulty PS/2 bus or controller; you can try a USB mouse or keyboard to see if it will help.
dlh6213
Posting Maven
3,117 posts since Jul 2004
Reputation Points: 63
Solved Threads: 214
USB is a rectangular plug, PS/2 is the small round connector (mini-DIN); this picture shows an adapter with a USB connector on one end and PS/2 connectors on the other (one for keyboard, one for mouse): http://www.ebusinesscables.com/images/394966.jpg
The "D" shaped connector is a serial port (DB-9); here's a picture of a male DB-9 on one end and a USB on the other end: http://www.coolgear.com/images/usb-serial-prolicif-chipset.jpg
A quick question, I had assumed you were using PS/2 connections since these are most common, but that may have been an incorrect assumption, what type are you using?
If you are using the PS/2 type, are you sure you have them connected to the proper ports (mouse-to-mouse and keyboard-to-keyboard)? It does make a difference. (Make sure the computer is off before connecting or disconnecting the mouse or keyboard.)
It may also help to know what OS you are using.
dlh6213
Posting Maven
3,117 posts since Jul 2004
Reputation Points: 63
Solved Threads: 214
If you had a bad ground/earth, I think you would have problems all the time, not just booting up.
Have you checked in the Device Manager to see if there are any problems there?
Are you having trouble with just an initial boot (after the computer has been turned off), or with a reboot as well?
Have you run ScanDisk lately? It would be best to run it in Safe Mode, but if you have trouble rebooting, it may not be the best way for you.
dlh6213
Posting Maven
3,117 posts since Jul 2004
Reputation Points: 63
Solved Threads: 214