problems with flashing

Hi, any help would be much appreciated.
My box was running an old gemini image from 2010 basically the one it was shipped with on ssl76 i think.
I have updated the bootloader whilst flashing an image, the box has accepted the ssl84 but ive tried several relevant images but they either get stuck in a reboot loop or crash and reboot whilst trying to set it up.
Could it be a hardware issue, should i go back to the previous bootloader and an older image? Confused....

I also mistakenly posted in the images thread so apologies for that. In brief my tuner was reporting nothing connected. All issues sorted now it was all down to the psu being faulty, bought a new one and all up and running. Phew...