Stuck on startup screen; locked firmware (password) won't allow CD Boot...?

When the system began to act strange, I tried to install with a 10.5 Update/Install Disk. When the software wouldn't install ("You can not install this software on this disk."), I restarted the drive, but nothing happened. I ran Disk Utility from the 10.5 CD. I repaird the HD, and restored the permissions by pressing the "Repair", and "Repair Permissions" buttons. When it indicated that the hard drive was "OK", (using the 10.5 Install Disk,) I set the firmware password locking it to keep others from starting with a CD.
Now, the startup screen will not display any users; the blue "load" indicator will not complete, and appears to be stuck. First I tried holding down the "C" key, but it wouldn't start from the CD. Then I tried re-setting the PBG4 to factory settings by holding down the option, command, "P" and "R" keys, but it won't make the second "reboot" sound, and continues with the blue "start-up" indicator. (I'm in real trouble, because I'm supposed to have my College Papers ready by this weekend, but they're stuck on my computer.) Does anyone have any sollutions??? Pleeeeeease help; I'l l b u y y o u s o m e c a n d y!

Welcome to the Apple discussions.
Usually you get a 'can't install on this disk' when you try to use a gray-faced system disk from another system, like MacBook or iMac or other non-Powerbook. Those disks are locked to the systems they are distributed with. The only way to upgrade to 10.5 is with a black-faced retail disk.
Have you tried starting the system holding the alt/option key down? That should prompt you for the firmware password, then give give you a choice of device to boot from.
You didn't indicate why your system was beginning to act strange, so don't know if that has any bearing on your current start issues.

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That is very unfortunate. When you connect it to your computer, will it sync with iTunes?
If your iPad will sync with iTunes, I suggest that you backup your iPad with iTunes, then proceed to do a software restore. To do a software restore, plug your device into your computer, click on your device in iTunes, then under the general device information (a picture of the device with the name, etc) is a button that says 'restore'. This will wipe all of the software off of your device (as well as all your apps and files, which is why you backed them up), including, more than likely, the software issue with not accepting user input.
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Hi,
I have a MacBook running Snow Lepard. Recently it would not pass the startup screen and stucks there forever.
I have tried used to boot off from CDs (both Snow Lepard and the OS before) and it did not boot from the CDs. This was not an issue before I upgraded to Snow Lepard and I can always repair the HD or reinstall the OS.
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What do you mean by startup screen?
Try here:
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see ya

@skippy75015...
HMM: http://support.lenovo.com/en_US/detail.page?LegacyDocID=MIGR-71062
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IPhone stuck on startup screen, crashes iTunes when I connect

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I've ran Disk Utility, there were problems that were fixed, but it's fine now (I've ran it again to double check), and I've ran Apple HHardware Test and I received" no trouble found".
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System files are missing or damaged so you need to reinstall OS X:
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I'm not going to read that huge rambling post, sorry.
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https://discussions.apple.com/community/notebooks/macbook_pro?view=documents#/

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Jamie,
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If Disk Warrior does not work you can try the following steps (but they may not work if the disk has a hardware error).
Get the disk (DVD or CD) that came with the system (since you have it listed as 10.6.8). If it is 10.7 or 10.8 use the Recovery partition to boot from or the USB installer if you have that option.
Insert the disk then power down
HOLDING the C key, power up to boot from the disc.
Get to Disk Utility
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Then HOLDING THE APPLE (or Command key depending on your keyboard) KEY AND THE OPTION KEY AND THE LETTER P AND R KEYS, continue hiolding them until you hear the chime tone for the THIRD time then release all four keys.
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If that fails then you are down to the "bitter end" of erasing the volume and reinstalling the OS and then all the other software.
If erasing the Volume fails then your last hope is to completely erase the entire hard drive, repartion the disk and try a re-install.
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Stuck on startup screen; locked firmware (password) won't allow CD Boot...?

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