T410 won't boot, blank screen and keyboard unresponsive at power up.

Hi, my Lenovo T410 laptop won't start. I hit the power button and it looks like it's about to boot up. The thinklight blinks on as normal, the cd drive is checked, the caps lock button blinks on, then nothing. No display, and keyboard is unresponsive. Power light remains on; if I leave it a while the fan comes on. I can turn the machine off using the power button, but the problem remains next time I switch it on.
I've tried removing power and battery, pressing power button 10 times then holding power for 30 secs, before replacing power and battery, but nothing happens. I've tried using a different keyboard. I've tried plugging in an external monitor. No change.
This problem appeared after I left it on overnight. I have a hunch that it went into hybernation mode, perhaps, and that it disrupted some important function which it was unable to complete. Not sure though. Any help gratefully received.
Many thanks,
Pete
Solved!
Go to Solution.

Hi, Fn+F7 didn't do anything.
So I took out the HDD and both RAM modules, including the one under the keyboard. At power on it beeped as follows: 1 beep, followed by 2 series of 3 beeps, followed by 1 beep.
I replace the HDD and one ram module under the keyboard leaving the other one out - this didn't change anything; I then switched up the RAM modules - again, no change. Does this mean the motherboard and processor are OK? What could the problem possibly be in this case? Very mysterious!
Incidentally, I should perhaps have mentioned that I kept the unit in an unheated room and it did get very cold there a few days ago, which coincides with when the booting problem first appeared.

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