Disk noise, no fan, no chime, won't boot. Any suggestions?

I have the dreaded 2011 MacBook Pro, and the well known graphics problem. I had the 2915-A board which went to meet its maker. I replaced it with a 2915-B board which was starting up but also exhibited the GPU issue after a while.

I tried to reset the SMC and PRAM/NVRAM, after which it will not boot. I get some disk activity but no fan (and no POST chime). I put this down to the GPU being faulty, but that's just a guess really. If I turn it on (get disk activity and no fan), the heatsink gets hot.

I have a green/orange light on the magsafe connector.

Any suggestions as to what I might be able to try to bring it back from the dead?

Many thanks!

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