From past experience, I'd wager that you've got bad solder joints on C1, Or it needs to be replaced. Another possible problem is that the multicolored wire connector has a weak solder joint, in which case you simply need to reflow it with fresh solder/flux. You can test this by wiggling the connector and trying to start the machine again. There are several members on this board who can reflow or re-cap your Mac if you're not able to do so.