Problem with sleep & log in screen - log in disappears & screen goes black

System: Mid 2009 MBPro 15". 4GB memory. 59.98 GB of 500 GB free. 10.7.2. External devices: Time Capsule, but not all the time.
My MacBook Pro has been developing this issue over the last several weeks. It is happening more and more frequently and I am afraid I may lose everything.
Another poster had a similar problem, which I have excerpted to save time (and he described it very well):
Scenario: Plugged into a power adapter, I close the lid of the machine to put it to sleep. When I open the lid to log back in, the screen comes up for approximately 4-5 seconds, then goes black. I cannot type fast enough to get logged in before it goes black. In fact, it seems to go black faster when I try to type.
If I close the lid while on battery power, everything works normally - although a couple of times today, it happened exactly as described above.
In addition, with the machine plugged in, I can close the lid, open it, wait for the screen to go black, UNPLUG it, and the screen comes back like nothing is weird. - again, this pretty much stopped working this afternoon.
I also noticed that when plugged in and the screen goes black, the white standby light never starts "breathing." When on battery power, however, it starts "breathing" normally.
Please help. My entire life (and career!) is on this machine.

It is not easy to say why this happen. In your last posting you wrote about some windows updates. Who knows what is wrong there.
If nothing helps, not even system restore and you want to use stand-by mode I recommend you to back-up all your data and install OS again using recovery mode.
With factory settings everything will be OK again but then be careful with updates.

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