Yes very sure the console is out of FSM, as I did get it back to the 3.55 XMB and there was no Red image saying FSM.... Also the console won't stay powered on long enough to read anything from a usb stick. I have tried putting the file on a pendrive to get myself out of FSM but of course this doesn't work.
I suspect that a previous post is correct and it is a blown fuse. I need try the method of connnecting a PC PSU and ruling out the PS3 power unit and then testing every fuse on the motherboard. Any suggestions on what and how to check these would be welcome....