Trouble with opening Mac system operator. Strange pulsing noise.

When I open the laptop it takes a while to reboot and the circular rainbow disc shows up for a really long time so i can't even authenticate the system. I closed and reopened the laptop many times to no avail and it started to make this loud pulsing noise. So I took the battery out. and although without the battery it made the pulsing noise I managed to authenticate it with my password and open the system.
What could be the problem? My mac is not even a year old. i use a regular adaptor since I am in Europe and it has an American plug. Could this be a factor? What should I do?

First thing you should do, if you haven't... Get the 3 year extended AppleCare.
Tough to say about the noise from here, but I'd try this first...
Get Applejack...
http://www.versiontracker.com/dyn/moreinfo/macosx/19596
After installing, reboot holding down CMD+s, then when the prompt shows, type in...
applejack AUTO
Then let it do all 5 of it's things.
At least it'll eliminate some questions if it doesn't fix it.
The 5 things it does are...
Correct any Disk problems.
Repair Permissions.
Clear out Cache Files.
Repair/check several plist files.
Dump the VM files for a fresh start.

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