When you purchase a 10+ year-old computer...you have to expect some issues. The flashing "?" can mean 1 of 2 things:
1. The HD needs an OS installed on it.
2. The HD that is in it is dead.
You won't know the answer to #2 until you try #1.
* Next question..."What OS version to install?" Answer...probably OS 10.3 or 10.4.
* Next question..."Where can I get these OS install disks?" Answer...eBay.
* Next Question..."I see these gray OS disks for sale. Are these any good?" Answer...no...they are model specific...and won't work.
I think that this about covers it!
- Nick