You appear to have gotten yourself "stuck" in the tool change cycle. This can happen easily by losing spindle orientation during a tool change cycle. This prevents it from going forward or backward since it does not see the orientation and does not want to try to change tools without it.
At this point you will probably need to force the tool change cycle numbers in your system parameters. NOTE: BE CAREFUL! You will need to find the tool changer sequence in your maintenance manual and probably remove the tool under the spindle for safety's sake.
Then you can SET the sequence number to the correct sequence number to get you to a recovered sequence such as 1 (ready). Use caution as when you SET the number, I/O will change to the appropriate settings for that sequence. If in doubt, call your Rep and have them show you how to do it.
If you can get back to the seqence 1 with the ready, It should step thru properly from that point.