There is no power :
Either power supply problem or blown surface mount fuse on the main board.
First check all SMD fuses on the main board, and the fuse on the power supply board.
If the power supply board fuse has blown replace it and try again, if it blows again
you need to replace the power supply. If the power supply seems OK check all
SMD fuses on the main board.
There are 7 on the V3 and about a dozen on the V4 / V5 / V6.
Just get a black screen :
Either a blown surface-mount fuse or damage done trying to install a mod-chip.
Damage will be around the BIOS solder points. Check for excess solder, clean up
with our de-solder wick. Also check for damaged tracks. If it's not due to a mod
check all SMD fuses with a multimeter or continuity tester. They should conduct
and have a resistance of zero. If this is not the case then replace with fuse of same
or similar value.
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