Your images do not show up. What did the messages say?
Upgrading the OS from Tiger and Leopard:
Installing Leopard OS 10.5:
You need to repair the disk, not just verify it:
You cannot do this from the same start-up disk. Reboot from your install disk (holding down the C key). Once it opens, select your language, and then go to Disk Utility from the Utilities menu. Select your hard disk as before and click Repair:
Once that is complete reboot again from your usual start-up disk.
Thanks so much Klaus. The help menu and booklet that comes with the Mac said to use the install disc 1 and hold down the D key when starting up, then choose language and run the hardware test. Thats where I got the ok with memory and logic board. I'll do the C key and follow your advise. Will post my results later, thanks again, you're a big help.