Wifi not working on laptop when power cable plugged in

Please help!

There was a power outage in my apartment last night and my laptop was plugged in at the time. Now when my power cable is plugged into my laptop I cant receive wifi!! Ive double checked and whenever the laptop is just running on batteries it can receive wifi. This is so weird and Im worried the power outage broke something inside my laptop.

The laptop is am Acer Aspire 5100 and the wifi is a Linksys router.

Thankyou, thank you, thank you in advance!

Tania