csPS3 shuts down after 15 se after trying to get into FSM

So I have been trying to downgrade my slim ps3 which was on 4.31OFW using the e3 flasher, I had to clamp this to get a good connection.

All seemed to be going well until I used the e3 card reader to trigger FSM, my dumps seem to be valid and I had the one I'm using checked on here and it was given the all clear.

The guide I followed is: ps3hax.net/showthread.php?p=387785#post387785

So after trying to trigger FSM, the blue light illuminated on the e3 dongle, then the system shut down, from here on the system will not stay on for longer than 15 seconds, no beeps, no hdmi signal, it just shuts off.

I have soldered the tristate to the sbe on the e3 cable and this allows me to flash my patched dump back successfully using the flash fun switch but the problem still remains when the e3 flasher is removed, and when I try and install firmware it does nothing and shuts down and no hdmi video is present.

Any ideas? I have reconnected the bluray drive and the hdd, I have left the cable soldered but the clips are not connected at either end so there should be no ground from the tristate.

I have also replaced the thermal paste and fitted the heatsink securely .

My ps3 is the CECH-2002A

YOUR DUMP IS VALID
ROS0/ROS1 is 4.25/4.31: Valid
tvrk_prog0 : 3.50 Valid
tvrk_prog1 : 3.55/3.55_DEX Valid
PS3 Model: CECH-20xx
Mobo: DYN-001