Tried to update Mac os x Maverick on Macbook Pro. Now computer will not boot

Question

Have tried several methods, but sound comes on as if it id trying to boot, but apple on screen with little spinning wheel

Answer 1

What exactly did you try? Try the following things one at a time. If you have problems with running the procedures, reply back. If one of the procedures fixes the problem, do not proceed with the remainng procedures, but reply back.
Try this first: did you try a safe mode boot? http://support.apple.com/kb/PH14215 last item in the table. If successful, reboot normally and test.
Try this next: did you try to boot to Recovery HD? Hold down option key when you hear the chime and select Recovery HD. Select Disk Utility. Select Macintosh HD and click Repair Disk. Repeat the repair until no errors occur. Once there are no errors, click Repair Permissions and repeat until no errors occur. Reboot normally and test.
Try this last: did you try a single-user mode boot?
Warning: Be extremely careful when doing these steps and double-check your exact typing before you hit enter! If a step does not work, stop immediately and report back with the exact messages please
Boot into single-user mode (hold 'command' and 'S' keys when the chime sounds
At the # prompt type   /sbin/fsck -fy    and hit enter. It goes through a number of checking stages. At the end it will either say the volume appears to be ok or ***** FILE SYSTEM WAS MODIFIED *****.  If it says it was ok, we need to do more things. If it gives ***** FILE SYSTEM WAS MODIFIED *****, redo this step until it says ok.
If step 2 does not even do the check but gives an error, please reply with the exact messages. If step 2 succeeds, report back please
Once that's done you can type reboot to boot normally and reply with status please.