Problem: The telescope is stuck.
Solution: Sometimes you may try to track on object as it approaches the horizon, or to aim at an object that is near the horizon. Aiming it to low will engage a factory default setting which causes the telescope to become non-responsive in order to protect the telescope. This is great for the scope, but might scare you. There is an easy fix. Go inside the dome, and look on the telescope's mount. On the east side, there is a key in the telescope, near a button that says something like, "horizon lockout override". Push and hold this button while someone in the control room tries to slew the telescope somewhere not so close to the horizon, such as the park location. Once the scope has moved away from the horizon, you can safely release the button and continue your session.
Problem: The Dome won't line up with the telescope.
Solution: IF THE DOME IS very FAR FROM ALIGNMENT - Manually turn the dome to face as closely in a cardinal direction as possible (N, S, E, or W). Now, on A.C.E. click the Dome drop down menus and make sure Auto Dome is turned off, then click "Reset Encoder". The dome thinks it is pointing in the direction labelled, "Dome is currently at azimuth". The azimuth in the North is 0, East is 90, South is 180, West is 270. Set the "Reset dome to azimuth" to one of the angles listed above corresponding to the direction you chose to aim the dome. This should get you close the alignment of the telescope. Now see the next section.
IF THE DOME IS only slightly FAR FROM ALIGNMENT - Go up in the dome, and look at its relationship to the telescope. you know that one rotation of the dome is 360 degrees. Try and guess how many degrees ahead or behind the dome is in relationship to the telescope. Now, on A.C.E. click the Dome drop down menus and make sure Auto Dome is turned off, then click "Reset Encoder". The dome thinks it is pointing in the direction labelled, "Dome is currently at azimuth". If the dome is ahead of the telescope add the estimated degrees to the current amount in the "Reset dome to azimuth".
Problem: 'Camera 2 failed to open'
'Solution: Restarting the camera' computer and turning on and off the CDD/QSI power strip fixed the problem (on the third attempt).
Problem: The telescope isn't tracking.
In A.C.E, under the Instruments tab click Auto Guider Display and make sure the Auto Guider 'On' button is selected.