A Disc from another Mac won't work if a Gray Machine specific Disc.
Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.
(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.)
If perchance you can't find your install Disc, at least try it from the Safe Boot part onward.
I found it!!!! The utilities folder was coming up in a small window and I did not notice the slide bar was all the way to the bottom. I went into disk utilities and ran "repair disk permission" then rebooted, The last two things on the list said they had been modified and cannot be repaired. I could not find any lines that refered to me to drag to the desk top. The bad news is that I still have seven question marks on that bar that cannot be removed. I appologise for the screw up.
No problem, did we ever delete those files & reboot?
Then move these files to the Desktop...
Reboot & test.