Some of the answers apple to Window computers, Dell, Lenovo, and the like. For Macs use the command key ( the one next to the space bar) and the "V" Key. Press both as the computer starts up. A black screen will come up and the some wording. You can the FSC the disc and do repairs as required. Also at some tome you may need to start up in "SAFE MODE" Start the computer, as soon as you hear the Mac start up chime, hold the "S" key down. continue holding until the computer starts up in SAFE MODE.
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When you say "load up screen", I assume you mean the Apple boot screen (it has the apple on a gray background).
You might try resetting the PRAM on the macbook.
You can do this by pressing and holding the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
So, turn the macbook completely off. Turn it on and immediately press and hold the Command-Option-P-R keys until the computer reboots and chimes. Once it chimes, release the keys. Your system should boot normally.
Macs use Intel's Extensible Firmware Interface (EFI) to perform the same job as a BIOS. Intel have been trying to introduce this for years, but thanks to Microsoft dragging their feet, were unable to put it into any production units until Apple switched onto their processors. Therefore there is no BIOS screen on a Mac, as they don't have a BIOS. hope this was helpful
The MacBook systems use Intel's Extensible Firmware Interface (EFI) rather than the traditional Macintosh ROM or PC BIOS. So, no such thing as going into the BIOS for advanced setup on Intel Macs (like you can on a PC).
Sounds like it could be a corrupted OS; have you tried forcing it to start up with the OS disk, holding down the 'C' key? That's the first place to start...
If it won't start up like that, you probably have a hardware problem. (You can get excellent troubleshooting guidance at: http://www.ifixit.com/Guide/Mac/ ) depending on your level of geekness, and assuming the warranty is expired?