Can you tell me where Kent and Mac Media are located...website please? I have the same problem now. Thanks!macmedia diagnoses slider boards for $40. and kent is very honest. i sent him a slider board and it came up fine. he can rebuild a slider board for $200! if that is the issue.
as far as the burnt cable. that isn't good. i'd predict at least a fried head and maybe slider board. do you have an old crappy clogged head that doesn't throw an error 07? if so you can unplug the head in question. replace or repair your data ribbon, and just plug in the damaged head (duct tape it to your carriage, you don't have to install it). see if it turns on.