MacBook Pro won't wake up or immediately goes to sleep on boot up

Having spent some time trying to figure this one out (assuming software to be at fault), I thought it was worth sharing in case others are having similar problems.
Because of the magnetic catch design on the current MacBook Pros, if you have a stack of MacBook laptops and have the top one open, you will not be able to fully boot the machine. Once it gets to the GUI, the screen blanks and the machine goes to sleep. The magnetic catch in the machine underneath causes the machine to think the screen is still shut - lifting the machine from the top of the stack releases the magnetic field and the machine correctly interprets that the screen is open, waking up the OS.
It's therefore possible that other magnetic fields near to the catch part of a MacBook Pro can also cause a similar effect, so one to look out for if you are suffering from similar problems.
I had been assuming that the machines in question had gone into a hibernated state as they had been left in the sleep state for a continued period, and the problem appeared to be intermittent, but applying across several machines.

Indeed blackburntw,
It is all down to the Hall Effects switch, used not just on MBPs , but on PBs before them.
The problem is particularly obvious if you put an MBP13 down on top of one of the plastic MBs, though, as you will see in various threads here. Gives you the Dickens of a scare, in fact, until you move the computer, as , as long as you leave it there, no troubleshooting process will resolve it!
You'll be glad to know that Google and Apple are both already on top of the matter, though. Apple released a KB item about the matter back in 2009. See http://support.apple.com/kb/TS2917
(Sorry blackburntw, I couldn't resist. It really is a very weird experience when you first run into it, I agree. When it happened to me I was fortunate enough to have been reading the KB updates in the previous week. Otherwise I might have been sitting there wondering what the matter was until my wife wanted to use her MB that I'd plonked my MBP down on top of so that I could snaffle her charger for a while! It is certainly worth posting a reminder about every once in a while.)
Cheers
Rod

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Indeed blackburntw,
It is all down to the Hall Effects switch, used not just on MBPs , but on PBs before them.
The problem is particularly obvious if you put an MBP13 down on top of one of the plastic MBs, though, as you will see in various threads here. Gives you the Dickens of a scare, in fact, until you move the computer, as , as long as you leave it there, no troubleshooting process will resolve it!
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Cheers
Rod

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MacBook Pro won't wake up or immediately goes to sleep on boot up

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