Your evo is not broken, but it sounds like you had a task killer on there and then uninstalled it. Is this correct?
No matter what the causing issues you can fix it real quick but you gotta restore the phone. If you save your contacts onto google contacts, this is not a big deal to do. If you didn't backup your contacts, you'll lose them but depending on if you have facebook and such you can get some back pretty easily.
"Power off the phone (remove and reinsert the battery in the case of a hard lockup). While holding down the