mac mini won't boot

I power on and I get the following

1. Power up music.
2. Disk spin up.
3. A blue globe in a white square displays.
4. A question marks ad smiley face alternaely displays.
5. Finally a gray circle with a diagonal line through it.

The boot up doesn't complete

Does anybody have any idea what's going on here. I'd appreciate any help

Thanks Mike neye:

Welcome to the forums!
Seems like you have a whole collection of different startup issues happening here:

mshepherd said:

3. A blue globe in a white square displays.

Click to expand...

http://docs.info.apple.com/article.html?artnum=31355

4. A question marks ad smiley face alternaely displays.

Click to expand...

http://docs.info.apple.com/article.html?artnum=58042

5. Finally a gray circle with a diagonal line through it.

Click to expand...

http://docs.info.apple.com/article.html?artnum=106805


There are also tons of threads on this forum that discuss each and every one of these issues. You might want to take a few minutes and search around to check them out.
:black: