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I also had the problem that the start sound was fine but the computer didn't bring up a picture onto the monitor and didn't boot. The reason was bad contacts (oxidized) on the video controller chip. New/re-soldered and now everything is good ... On other computer systems there are diagnostic...

... a little difficult because there are only three legs affected from the video chip. But it's been running for a whole day now ...

The video failed after a while again and this time I resoldered the two missing spots on the video chip and so far it seems to be working. The problem is that the oxidized areas cannot accept new solder even with a lot of flux !!!

unsatisfactory result It's working again, apart from cleaning a few via´s with isoproanol, I didn't do anything else. Power supply is fine

Cool ... Thanks

I have a Q700 with the fault there is no Video Signal Output. There is no sad mac sound so I think the mainboard is fine except the Video Out. The NVRAM battery wasn't leaking but the video chip has an oxidized spot on three legs and one spot was soldered. Need some tips what should I do with...