hey happy new year
possible it coulld be one of two things
if the fault was intermittent -this would suggest that you may have a physical fault, such as a dry joint.
if the mpc were shut off during flash programing - i would have thought it would just hang and thats all you would get.
i've never had the power fail while flash upgrading th OS so i've no direct experience with these symptoms - if someone has please feel free to comment.
heres the akai s link
www.akaipro.com/supportos.php#MPC1000
lets hope this sorts it out.
one thing you could try is taking out the 128mb ram and seeing if it boots with the basic ram.
cheers
f