Why doesnt my computer respond to keyboard

Hello, I have a Dell computer circa 2004 and suddenly the computer isn't responding to the keyboard or mouse. We have been doing "shutdowns" and replacing the mouse and keyboard. The CPU and monitor seems to be working, but the monitor tells me to enter control/alt/del. I am unable to enter anything!
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More about doesnt computer respond keyboard
  1. Model please.
  2. Try disconnecting both mouse and keyboard from the USB connectors, then plug them back again.
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