Freeze plus high pitch sound during win7 start up

Hi,
I have a problem with my new W520.
During win7 start up, my computer often freezes, and when it does so, a high pitch sound sets in.
After turning off the computer and trying again a couple of times (often 4-5) it suddenly works again.
I think it is a temperature problem that makes the computer mess up during start up when it is not warm enough.
I took the computer with me on a small vacation to south east Asia where the temperature is generally higher than here in Denmark, and during my vacation I had no problems at all.
Is there anyone who can help me with suggestions to what the problem might be?

Does it freeze and shutdown or just freeze?
Can you try booting without the AC adapter attached?
W520: i7-2720QM, Q2000M at 1080/688/1376, 21GB RAM, 500GB + 750GB HDD, FHD screen
X61T: L7500, 3GB RAM, 500GB HDD, XGA screen, Ultrabase
Y3P: 5Y70, 8GB RAM, 256GB SSD, QHD+ screen

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