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Usually computer keyboards are not locked. The problem which
you're facing it due to the non-recognition of the keyboard by your computer You should shut down your computer, switched
off the power supply then remove the keyboard connectors and plug them again.
Then you should on your computer and your problem will be solved.
If you'd still face problem then go to My Computer>Control
Panel>Keyboard>Hardware settings> Troubleshoot. And your problem will
Shut it down.
Remove the power-cord.
Buy a can of compressed air ($3 to $5).
Remove the side panel(s).
Hold the can of air vertically (do not tilt it),
and blow away the dust from everywhere: inside the power-supply,
between the "blades" on the heat-sink & fan on top of the CPU.
Replace the side panels.
Reconnect the power.
Start it up.
Right-mouse click on My Computer
Under "Startup and Recovery", click "Settings".
Click to disable "Reboot Automatically".
The next time that it crashes, what error-messages _stay_ on the screen?
It is not easy to see exactly what you are saying but lets see if I can be of assistance.
If your modem is external to the computer (box plugged into the PC via a cable) then the modem staying on is normal.
If you are on high speed this is expected and you do not have to turn it off
If the light on the back of the computer is right next to where the cable from the modem plugs in then the light being on is again normal and that place where the cable from the modem plugs in is NOT a usb port.
There may be some usb ports quite near which may confuse you a little
Even if the computer is off some of the newer computers have the facility that can wake them up if they get a special signal down that particular cable. This is know as WOL or Wake On Lan and is nothing to be worried about.
Try restarting in safemode. Shut down your computer, then manually restart tap either the F8 key or F9 key, sorry I don't remember which key it is, but try F8 first. Then go into safemode, when it's loaded try a restart and see what is does. Good Luck