MacBook won't start in any kind of mode

Hello,
My MacBook Pro won't start up in any mode (recovery, internet recovery, safe mode, new external HD)
This is wat happened until now:
- I was doing an update for the newest version of iOS In the Mac App Store.
- While the System was downloading the update it jammed.
- I did a force reset with the on/off button
- Than i turned the System back on and it started with a grey Apple icon with a progress bar underneath.
- The bar went up until it was about halfway and the System just shut down and restarted. This went on and on and on, until I did a hard reset again.
- I tried to start the System in recovery, internet recovery and safe mode al did nothing. It started but also at some point the system shutted down.
- I also tried to boot from an external hard drive, that didn't worked neither.
- I took my hard drive out and connect it to another MacBook than start up with the hard drive and that worked, so my hard drive is fine.
- reconnected the battery, took out the rams but all with no luck.
My MacBook Pro data:
- Model: MacBook Pro8,2 (Early 2011)
- Processor: Quad-Core Intel Core I7 2,2 GHz

Try SMC and PRAM resets:
http://support.apple.com/en-us/HT201295
http://support.apple.com/en-us/HT204063
Then try a safe boot.
Ciao.

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MacBook won't start in any kind of mode

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