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No, it does not. I was able to get the system past the grey screen ONCE this morning, after which it attempted to load my Bootcamp install - which unfortunately didn't actually work since that drive was removed at the time. It stuck at the grey screen after that, even with the Bootcamp drive reinstalled.

Fortunately is looks like my Time Machine backups were working, I was able to get my work off via my ancient 2006 Mac Mini. Too bad it can't run the software to actually open it!

have you tried doing a clean install? I'm not saying a clean install will work, but it will help rule out things.
 
Did you do a PRAM reset after replacing the battery?

Cycle it 2 or 3 times before releasing the keys.

Hmm didn't know I needed to do that. Anyway, I dropped off MP at service centre just few mins ago. The lady at the desk who accepts orders asked me if that's an iMac :) So I hope they know what they're doing. I got pretty good references on that place, technicians should be able to diagnose it.
 
So the technician sent email later this day telling me that the SSD is causing the system to freeze, booting off from external USB drive works. He will try to use their own SSD to see if mine is really faulty.

If this is true then that's great news since I was worried that CPU board or sth like that was faulty.

Now I need to say that this is very strange. Because right after I found out about the problem, I disconnected all peripherals and all SATA devices, including SSD and DVD drive. It did not work. I wonder what has changed, I replaced battery and did PRAM resets, I also reseated GPU... so who knows.
 
, booting off from external USB drive works. .

It's moments like this when it pays off to have a clone of your system volume on another drive (either internal or external).

So when booting goes awry, it's a tremendous relief to see the clone start up successfully.

Booting the Recovery partition would likely not have worked if your system drive is faulty. Hence the need for a full system clone.

Disk Utility's Restore tab will make a bootable clone.
 
It's moments like this when it pays off to have a clone of your system volume on another drive (either internal or external).

So when booting goes awry, it's a tremendous relief to see the clone start up successfully.

Booting the Recovery partition would likely not have worked if your system drive is faulty. Hence the need for a full system clone.

Disk Utility's Restore tab will make a bootable clone.

I have a bootable clone on one of the internal drives but I even couldnt select any boot options, not even recovery see thats the problem. The OS isnt broken,its hardware fault of SSD which causes tomhalt the system. Now´all I need to do is to get a new SSD, probably Samsung 840 evo and clone the volume.

Never did that before. Can I boot my CCC backup and restore itself onto SSD?
 
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