A1145 iMac 20" Startup issue
This 20" iSight iMac (model A1145) was left by a neighbor who moved. It seems to be functional to a degree, and shows no signs of abuse. However, on startup, all that happens is the chime, followed by the screen lighting up, but no grey apple or gear image or the blue startup screen leading to the desktop.
I have tried inserting a Tiger install disc and restarting with the C key depressed. For a second, the normal grey apple appears, and then it seems to freeze for a long time. Finally, probably 15 or 20 minutes later, there's the folder image with a Mac face on it - not a question mark. On other attempts, only a blank lit screen is present.
To shut down, I have to push the power button. The disc can only be ejected with the left mouse button down on startup.
There seems to be some functionality here. What could be the problem? Are there any steps/procedure one could try to revive this iMac?
Or what repair would be necessary? Anything I could do myself? What sort of shop repair are we looking at?
Thanks