Hi! My name is ***** ***** I'm happy to help!
Sounds like you need a new power supply, which will require opening the case to replace. It isn't as hard as it sounds, unless you feel that you are very technically challenged. Here is a link to the power supply you need: CLICK HERE
And here is a link to the instructions you need to replace including a video: CLICK HERE
I'll be here if you need more help!