my mac lost power and now my mouse and keyboard won't connect

Hello,

Is it Wireless or USB?

If USB try this...

reset FW bus, same goes for USB reset...

Reset the Firewire bus

If your Firewire or USB isn't recognizing any device. A solution which has worked for some whose hard drive became invisible in 10.4 was simply to follow these four steps to reset the Firewire/USB bus:

1. Shut the machine down.

2. UNPLUG the power lead to the computer and any firewire/USB drive or devices.

3. leave it for 10 minutes.

4. Connect back up and reboot.

http://www.macmaps.com/firewirebug2.html

BD, could try an SMC reset as well.

http://support.apple.com/kb/ht3964

Should pay attention to the timing noted in the article.

Quiter possible, thanks, worth a try! 🙂