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Laptop squeals at boot

I have an Acer Aspire 5100-3357 Laptop that squeals when it boots up.  If I push some keys, and it really doesn't matter which, the squealing goes away and the computer boots to windows.
A little background info:  When I first had this problem a few days ago, it was even worse.  After the squealing stops and the computer boots up, the cursor would take off or skip a letter while typing a document or if in text box of any kind.  I removed the keyboard and blew it out with my air compressor and it worked great for about three days.  Now the squealing is back, but the typing is fine.
I'm not exactly positive the squealing is the keyboard, but it seems to be.

Any ideas?

Thank You in advance!
PhilW
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Thank you for your quick responses!

I would like to keep this post open until we figure out the problem.  The computer hasn't made the sqealling noise since the first post.  I think it could of been a stuck key since the cursor was doing crazy things while typing.

But, now that the cursor isn't doing that anymore and it still squealled at me, it could be a Fan or possibly the Hard Drive like you guys have mentioned.

Will keep you posted.
Thanks again!
PhilW
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Okay, I had my neighbor bring his laptop back over, but it never would make the noise for me after 2 days.
He picked up the computer and took it home and it made the noise as soon as he started it.  This time I had him listen to where the noise was coming from.  He said it was coming from the speaker.  So I had him unplug the printer and the noise went away.
Maybe the printer got a surge of electricity and the computer was giving us a warning???
Thank you all for your expertise!!!
PhilW