That means the MacBook can not find a bootable device to startup from.
First thing to do would be try starting up from the CD's that came with the MacBook or the Mac OS CD if you have updated to a newer version of the OS ( 10.5 or 10.6 ).
If the MacBook starts from the CD, good news your computer is still good, just the Hard Drive may have failed or be failing. You can check and see if they Hard Drive is working by going to the Menu on the 1st or 2nd screen when you are booted from the CD and pull down to Disk Utility.
Once you are in Disk Utility if the is more than the CD showing down the left then there is hope, now look and see if the name of your hard drive is listed ( default is Macintosh HD ). If you named Hard Drive shows and you have an external Hard Drive w/ enough free space I would try backing up your drive at this point using Disk Utility to make a disk image on your external hard drive.
Now that you have either backed up your hard drive, already had a current backup or have given up all hope of getting data back, you can either try
- Just reinstalling the OS on your hard drive ( not my favorite choice, since you might be installing over existing problems and have more in the future ).
- Erasing the hard drive and installing a clean copy of the OS and re-installing your applications from the original disk and then recovering your data from the backup.
In either case there is the worry that the drive is starting to fail permanently, so now that you have been given a 2nd chance make regular backups or replace the hard drive. ( The hard drive on these is fairly easy to replace and instructions can be found here
http://manuals.info.apple.com/en_US/MacBook_13inch_HardDrive_DIY.pdf .
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