Strange sounds/not starting up

I was using my computer just fine earlier tonight. The battery got low and the computer powered down.
Now, I cannot get the computer to start back up. It makes sounds like something is running smoothly. I've tried starting it up several times and done some of the keystroke combinations I've read on other posts (command, option, p, r and shift at start-up). Every time I can get it to do something, I either get a gray screen or a folder with a flashing question mark and one time I got it to get to the Apple logo where it just kept spinning.
Any ideas?

asyversen:
If you have the original HDD in the computer it is probably failing of failed. These HDDs have an average life of 3 to 5 years, and yours might have retired. If you are able to boot from the install disk to a Repair Disk
Insert Installer disk and Restart, holding down the "C" key until grey Apple appears.
Go to Installer menu (Panther and earlier) or Utilities menu (Tiger) and launch Disk Utility.
Select your HDD (manufacturer ID) in the left panel.
Select First Aid in the Main panel.
(Check S.M.A.R.T Status of HDD at the bottom of right panel, and report if it says anything but Verified)
Click Repair Disk on the bottom right.
If DU reports disk does not need repairs quit DU and restart.
If DU reports errors Repair again and again until DU reports disk is repaired.
If DU reports errors it cannot repair you will need to use a utility like Tech Tool Pro or Disk Warrior
Please post back, particularly on the S.M.A.R.T Status.
cornelius

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