Keyboard and mouse not responding at logon screen



For my Windows Storage Server 2003, the keyboard works before Windows loads, but at the logon screen, neither the keyboard or the mouse works. I can press f8 and go to safe mode, but the keyboard and mouse still won't work.

Three days ago, I installed Symantec Endpoint Protection on the server, but there were no signs of any problems. Yesterday, I installed Windows updates, changed my network administrator's password, then I restarted the server. I also turned-on Windows firewall (I did not install Symantec with a firewall). Since then, I haven't been able to get past the logon screen. I cannot even ping the server on my network. The server is a 64bit machine, and there are no PS2 ports on it.
bobox00Asked:
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bobox00Connect With a Mentor Author Commented:
I tried different mice and keyboards, and finally one of the mice worked on on of the USB ports in the back. I swapped the mouse and keyboard and the keyboard worked, but the mouse didnt work on the other port. I then restarted and was able to login. After I logged in, the system detected a USb human interface device, another USB device and a USB mouse, one after the other. I proceeded to install each of them. The system now works fine.
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nobusConnect With a Mentor Commented:
can you do a system restore to a date it worked?  then install downloads 1 by 1 and t'est each
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nobusCommented:
strange behaviour i must say - tx for the feedback!
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bobox00Author Commented:
A Dell technician told me that a mouse could have failed and caused the system to lock-up.
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nobusCommented:
i agree, but this is strange :  I tried different mice and keyboards
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