Dell XPS M2010 keyboard problems

My mom has a XPS M2010 Dell Computer. Recently her keyboard which I think connects via bluetooth stopped working. The lights blink but does not respond to the compuer. I read somewhere to attach a USB mouse and keyboard and this will help but the problem is my mom has settings which require you to press ctrl alt del when you log in. As the keyboard is not responding how can I log in.

The usb mouse works but not keyboard. Please someone help me.

Thanks in advance

Noori
 
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