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I'm having a little difficulty understanding exactly what your problem is. If the computer experienced a hangup and shut off, I would try turning it back on again. If the computer is "frozen", try holding down the power button in excess of 10 seconds or until it makes a clicking noise (usually, but not always, so worry if it doesn't happen) and turns off. Then proceed to turn it on again.
I get the feeling I completely missed the mark on this answer, so if you'd like a better one I'm afraid I'll need a little more information about your problem. ;-)
Make the following check:
If you can open back cover, try to check and clean fan to ventilate or there's already available docking station with ventilation pact it can help.
You should not use a laptop on a soft surface such as a duvet or bed covering. The device needs to have free air intake and outlet to cool the processor. If you block the intake, which is probably under the machine, it will overheat and shut down. If you want to use it in bed put it on a hard surface such as a large book, so that the air intake cannot be blocked.
1. Boot your system in "safe mode" and check whether the problem persists. If so the problem is due to some freshly installed software, which you can of uninstalling.
2. If the shutdown happens when you are running on battery then check your power management software whether the battery is draining out rapidly.
If problem is still there, then instead of trying your self, please consult your local lenovo technician / support centre.
When systems power off suddenly, always suspect - the power first. I would then look at heat and physical connections next as culprits. Memory errors almost always show up as blue screens. I say try a new power supply and see what it does. Its not a lot of money either way.
Run CPUID Hardware Monitor and watch your temps. You will have to turn logging on or you will lose the data in a crash. Make sure your CPU heatsink is still connected properly. Things have a way of working loose.
You can power drain the pc if the bios won't update.. Turn off the pc then unplug cables from the desktop or laptop then remove the battery (only on laptop) , then press and hold the power button for 5 seconds.
Then replug all cables and batteries. Then turn on the pc and check the Bios if it updates.
You can call our technical support if it isn't work at 1-877-4-536686.
Have a look under your control panel for power options. I'm using Vista but should basically be the same. Click on "Change when CPU sleeps" Go into advanced power settings.Will prob give you option with your power plan. Mine on high performance but you can change the others if you want.. Look under battery options and see if you maybe have you battery option maybe turned off?? I've got a Acer Aspire 4920G so it should be around the same operation. Let me know what come of it.
It must be a processor overheating problem, check the vents are not restricted and if the fan is always on or never comes on because of a faulty temp setting then theres a overheating problem and the processor will shut down before any damage.