It may be rebuilding. Do you not have a disk activity light on the machine?
Rebuilding a raid array with 3x 250GB drives could easily take a day or so depending. I would expect 10-12 hours at most but stranger things have happened to me on much more powerful hardware.
Restarting during a rebuild is in *most* cases safe to do. May want to give that a shot and see if you get anything different.
Really wish I could be more help, but I tend to avoid these types of 'softraid' controllers like the plague. Had some quirky issues with them in the past that left a really bad taste (single disk failure in RAID 1 crashed the system and prevented booting until the drive was removed... really?!?