Currently Being ModeratedFeb 20, 2013 3:04 PM (in response to thismightbezach)
thismightbezach wrote: ..Is this a hardware problem that will require a professional to fix?..
Based on the symptoms you describe, it seem to me.
If Apple's http://support.apple.com/kb/HT2090 suggestions do not help you, (be certain that you use the correct "reset" procedure for your specific Mac model), yours is most likely a hardware problem that will require a professional fix. Unless you have a current backup, make one now. Then use Apple's final "Troubleshooting" suggestion:
"... contact Apple or an Apple-Authorized Service Provider for service."
thismightbezach wrote: ... How much will that cost?
The AASP can give you an estimate after he checks out your Mac. There may be a charge for this if your Mac is not still covered by AppleCare or other warranty.
It is entirely reasonable for you to ask for a repair cost estimate before repairs begin so you can decide whether it is cost effective to you to have any needed work done.