MacBook Won't Start Up!! Please Help!

Hi all,
I have a Aluminium MacBook which I purchased online at Apple, I have had the MacBook about 2 months, all was working ok until last night when I went to start it and it wouldn't get past the grey Apple screen...
This morning I tried it, it did boot up but took AGESSSSSS I do have AppleCare but wanted to see if I could do anything before calling them?
Feel really dissapointed, especially as I have a old Emac which I've never had any grief with grrrrrr...
Any help/suggestions would be greatly appreciated, but simple terms only, I have VERY limited knowledge
Thanks in advance,
Amy

Hi all,
Right, I've not got any further with my problem, after seeking advice on here I went home rung AppleCare who suggested what you guys did and with the install dvd in the machine I went into Disk Utilitys and 'repaired disk' It completed successfully and said 'The Macintosh HD appears to be ok'
So I was told to restart, which again took about 20 mins booting from the dvd. So I was then advised to 'erase disk' which I did.
I was then told I would need to reinstall Mac OSX again from the dvd which I did but got a message reading something like 'checking dvd for consistancy' There was a 'skip' option but I thought I'd let it go through it's motions which painfully took about an hour. Then clicked 'install' only for it some moments later saying 'install failed'
I got the following message:
*The installer could not make the computer start up from the volume 'Untitled' you may need to select your disk using the startup Disk Utility. Restart to try installing again.*
That's as far as I got, as I'm not confident enough to try anything else without getting advice on here or calling AppleCare but by this time had closed. They said its either a software or hardware problem and that was part of the elimination process, so I'm guessing this looks like a hardware issue would I be right in thinking that?
If so, where do I stand with getting the MacBook replaced as its under 2 months old...
Please advise, I'm clueless here
Thanks in advance
Amy

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I apologise for my English from the very beginning. Be patient please...
I see from older topics that I am having a rather common problem. I just got this iBook G3 900 MHz 12' 680 Mb RAM from Ebay. It lasted 5 days (working fine) and then it suddenly died.
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