My mac pro only shows a blue screen during startup? how do i get out of this to the desktop?

Cannot access the desktop, only the Apple sign and pinwheel icon come on, after a couple minutes it goes to blue screen only. Have held shift during bootup to start in safemode, but this doesnt even allow you to choose safe mode. Please help.

Try holding option+Apple Command + s keys to get into single user mode.  May be a little unnerving as it will get you to text based screen. Grab a pencil and paper and copy the commands that are listed also pay attention to the spaces.
/sbin/fsck -fy <return>
If the it says File System Modified hit the up arrow key it will repeat the line you typed. Hit return.
If it DOES NOT say modified then type in the second line.
/sbin/mount -uw /<return>
At the prompt type reboot<return>
Let us know if it helps.
Ciao,
Lou Cioccio

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