"Orange light flashing, boots for 2 mins sometimes and then dies.... so I'm assuming it is the power board connection."
If you can get into your BIOS, turn off the power management.
It's been a few years, but I had a Toshiba that wouldn't boot completely and when I turned off the power mgt, it worked fine - then the battery died and wouldn't hold a charge. But that 's another story.
AS far as the hard drive enclosure is concerened. I'm unfamiliar with your machine, but if you can remove the hard drive and it's functional, and yo can plug it in to a new machine, then yes it will work. I've done that with desktops without an enclosure. I just plugged the disk drive in and copied everything off of it that I wanted.