The power supply is a standard center positive 5.5x2.1mm barrel connect, 24v, and 120w.
I'm partial to meanwell power supplies, model GST120A24-P1J would be a good fit, though it's easier to find GST120A24-P1M (p1J is 2.1mm center pin diameter, P1M is 2.5mm). Often a 5.5x2.5 will fit well enough on a 5.5x2.1, though you can pick up a 5.5x2.5 female to 5.5x2.1 male barrel adapter for cheap.
Alternatively replacements are available from sites such as BRS.