The troublesome XVI part 2... Constant blinking power light... any ideas?

[H68k]

Hello

I recently replaced the original power supply my XVI came with, for a PicoPSU. and all was working well... up until my 'troublesome' XVI has now developed another problem...

Upon plugging in the external power brick. the machine will now power on. and the power light will remain blinking or steady green depending on the position of the soft power switch on the base, and it wont do anything else... there's video output.. but it's a blank screen and poking the reset button seams the reset the motherboard... but the rest of the machine doesn't seam to do much else.

Sometimes... if left running for a while or repeatedly reset. it will shut down.. and then will power on as normal when the soft power switch is pressed. if left unplugged for a while.. . it's back to square one, with the same problem.

I only remember it doing this once, with it's original power supply and i didn't think much of it...

Does anyone know what can be causing this?? is it fixable? or is my machine screwed?