Why does %system take so much of my system resources half an hour into computer turned on.

I recently inhereted an i7 8gb ram 256gb ssd retina 15" mbp from my father and I am trying to use it but it keeps malfunctioning.
The error:
Activity Monitor is set to launch at start-up so I kept track of the Activity of CPU, due to starting the troubleshooting of this error.
What I found was that when computer starts the CPU would be idle 95% and when the computer would be on for half an hour the %System would start to take all of the remaining idle cpu. Regardless of what I was doing, wether just leaving the computer and not doing anything, or playing Starcraft 2. Either way the %System just destroys the CPU about half-an-hour into start-up of MBP.
I have done a system restore (via turn comp on, hit command+r and do the online factory restore) twice.
I have switched user accounts because I was thinking it was something I did on this account. Still happened.
I have googled to see if anyone else has a problem like this but couldn't find an exact replica of the situation, just similar problems.
I have done Software Update and still nothing.
Side-note:
Computer was not used for 4 months, and when I first tried to use it it would not turn on. With or without charger connected.
I left it to charge over night and nothing. Packed the MBP away for a few days. Then tried again to turn it on via charging, nothing happened and about 5 minutes after trying for the first time (kept it plugging in without disconnecting) I noticed a minor cloud of smoking rising from the MBP out of the back, behind the monitor. I closed the monitor and the MBP turned on. Now when I move the MBP around I can hear "broken things" moving around in the MBP. Now the battery is shot and reads as being not present.
Not sure if the side-note has anything to do with the main error but thought I would add that in. If anyone can help me out I will be forever grateful of them.
Update: I read some other peoples "problems" on this forum and found that you can view "system processes" from the drop down menu in the top right corner of activity monitor. And kernal_task is taking 600% of CPU. And someone asked the original poster "did you launch anything at all that would affect the kernal_task" and he said no. Well Im in the same boat. I did system restore over-night. Went to log-in and noticed the usual... 30 seconds login with half a second delay with keystrokes. (mind you this is the first time using after computer did restore. All it did was sit idle, and had a user log-in).
Also another thing I forgot to mention was that when I turn computer off and then turn it off (shut down. manual start-up) then the problem would reset. But if I did a "restart" then the computer would restart with the %system consuming all the resources as it did before.
Message was edited by: Violentce

If you believe the information shown for your product is incorrect, you can submit your proof of purchase online or by fax. Your sales receipt is needed for Apple's 1-year limited warranty and AppleCare Protection Plan validation, so be sure to keep it in a safe place. Apple's 1-year limited warranty is the same whether or not you register.
that was off of the page for checking warrenty.
so to get mountain lion i have to go into the store? there is no online downloading??

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