Thanks for using the forums. The PRO-HD does in fact use 2 different types of power supplies, both the Ktec and V-Infinity. If the replacement PSU doesn't work though, it generally means the issue is within the Slingbox itself. You can always contact our internal store to see if you are eligble for a refund for your power supply. If it is the Slingbox itself, you would be eligble for our upgrade program. Please see the link before for more information about our upgrade program.
Hope this helps,
The Sling Moderation Team