It sounds like the disk has been corrupted, do you get the option to press Tab and choose rolback or factory reset as shown at the end of this KB - https://kb.pulsesecure.net/articles/Pulse_Secure_Article/KB10157/ ?
If you cannot recover the system this way then it will need to be RMA and a replacement delivered.
Thanks for your response! No... unfortunately there was no option to Tab. Whatever key I pressed it says: No Operating System Found. How come there is no hardware button to press to reset to factory setting? Juniper SSG has a hardware button to press to reset to factory setting, I could not find that on SA2500.
I don't believe a factory reset pin button has ever been part of the design for the IVE appliances, the closest thing I know of is the pinhole on the front of SM-160 and SM-360 to perform a restart.
As the system is consistently not booting to the point where you can select rollback or factory reset then the disk is corrupted and the SA2500 should be RMA to get a replacement. If it does manage to recover and you can rollback/factory reset please generate a snapshot (with debuglog and config included) soon after you log in and open a case so we can look to see what it is reporting about the disk status as it might fail again in the future.