MBP not loading with os x on internal harddrive, works fine with external os x

[XplosionInTheTy]

Ok so here's what happened:

last night finder froze in the middle of working. firefox continued to work perfectly, but i could not click anything on the desktop or finder menu (color wheel as cursor during finder, regular cursor for firefox).

i shut down by holding the power button for 10 seconds and when i rebooted i got past the gray screen with the apple logo, but after that the screen keep switching from a bluish/gray screen with the same loading circle as the apple gray screen, and a bright blue screen with nothing on it. this continued for around 15 minutes before i shut down again by holding the power button.

i then tried to reboot in safe mode but it didn't work. next i inserted the startup dvd and ran disk utility on the hd and it reported no errors. i tried to restart from using the internal hd again but the same screens appeared so i shut down again via power button.

next i started it up again with the dvd and restored the mac internal hd to my external hd (western digital my passport 320 gb connected via firewire 400). after it finished i went back to the start up options and restarted using the os x on my external hd. the mac booted up perfectly and i have complete access to all my file.

i restarted while using my external hd to see if i could then run os x on my internal one, but the original screens happened again.

i shut down and rebooted again using the external os x and it works perfectly still.

i went back to disk utility to see if i could restore the external hd to the internal one but it failed. i then tried to simply drag the os x folders from the external hd to the internal on, but it said i did not have the appropriate privileges (even though i am the only user on the mac).

basically what i want to know is how do i get os x working on my internal hd again and how do i move the os x files from my external hd to the internal one so i can start the mac and run programs without the external hd attached.


specs:
macbook pro 15 inch
2.4 ghz core 2 duo
4 gb ram (apple factory installed)
250 gb serial ata @ 5400 rpm
running leopard 10.5.5

thank you to anyone that reads this and can help. sorry for the long post

[Satcomer]

Sounds like either the hard drive is failing and you need to replace it or OS X is so screwed up you will have to wipe and reinstall.

Sorry for the bad news and no software trickery will fix broken hardware.