What does a circle with slash mean on screen?

My MacMini server has been giving me problems. It won't stay on. First I got the folder with the question mark. Now, I'm getting a symbol of a circle with a line through it. I've been to the Genius Bar. They put the two disk drives as one, and put a clean copy of the system on it. I brought it home, updated the system as per the Apple store notification, put on Filemaker server, 1Password, and Dropbox. It's still not working. The tests they've run in the Apple store haven't come up with anything. But what does the circle/slash mean?
Thanks.

But what does the circle/slash mean?
It means that the the partition you're trying to boot is unusable.
Boot to the Recovery partition, run disk utility and repair your normal boot drive. Then try a restart.

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System: *PowerMac G4 DDR 1GHz with 1.25GB RAM and Tiger 10.4.10 (or .11 not sure)*
At first, I could not get the Mac to get to the login screen i.e. it boots up but the timer symbol thing (you know that clockwise 'loading' icon thingy) keeps cycling for hours (eventually I switched it off not to waste electricity).
Tried second time using OS X install disk and check + repair disk, then boot up - still the same symptoms. (NB. Looks like I can do the fresh install though but that is not my intention just now).
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In single user mode, it stops after the 'got bootdisk...' and no flashing of the keyboard cursor.
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+Have not changed the PRAM battery or reset PMU. Have been off the grid (off at socket for quite a long period but does not normally do this).+
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My questions are:
1. What is that circle with slash icon mean? (can only find on Intel Mac pages - could not load boot.efi, or some other issue)
- ref: <http://support.apple.com/kb/HT2674>
2. Is installing a new system folder the only solution?
3. Do I need to get a new battery?
4. Is my startup hard disk at fault?
Thanks.
dean

Hi Dean,
Have been off the grid (off at socket for quite a long period but does not normally do this).
I'm pretty sure the battery is extremely dead if the computer has been off the grid. Remove the PRAM battery and see if it starts. A new battery is always a good place to begin. We've seen plenty of posters here say their MDD startup problems cleared up with the installation ofa new battery. I get my batteries here:
http://eshop.macsales.com/item/Newer%20Technology/BAA36VPRAM/
I don't know your geographic location; if you are not in an area served by the above reseller, you can use the specs in that link to shop locally. Bottom line--you need to eliminate the battery as a suspect before proceeding with troubleshooting.
If a battery is over a year old I don't bother testing it. I've had too many PRAM batteries test 3.6V in my hand yet did not perform well enough under load to propelr work in teh computer.
Another easy thing to try is a Safe Boot. Info here:
http://support.apple.com/kb/HT1455
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What does a circle with slash mean on screen?

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