"I only get 1 flash, sometimes 2 which looks the RAM has gone bad.
I imagine I have done something while reseating or reflowing U7 or U8."
Not necessarily - You have a fault and by removing the Chips, you have just highlighted it. I would not waste money on an Altek, as I think all you really need to do is remove each chip, look for bent legs and give them a light sand with 360 Grit sandpaper. You could literally be 5 minutes away from having a trouble free board for years. I've seen dozens of boards not booting and then simply cleaning and reseating Chips fixes the problem.
