Thanks firstly to Individual Computers for their excellent Hardware
So I have an A500Plus which did suffer badly with battery corrosion which wasn't initially a problem. Over time however, it failed and I sent it away for repair - now all appears ok.
I splashed out on an ACA500Plus which works perfectly, however recently I'm getting a problem whereby when I cold boot my Amiga, the diskmo cycles through all its codes up to 99 then to FE. When it gets to FE I know that everything is OK to boot into Workbench.
I have been getting increasing issues whereby the diskmo counts to 99 and stops there. This prevents me from pressing enter to boot into workbench.
As I dont have a list of the codes, I have no idea what a code 99 is.
The only solution to the problem is to keep powering off and on until it finally works
I don't believe its an issue with the ACA500 plus as I have connected it to an additional standard A500 and this appears to work.
Any ideas folks?