Firmware fail = non-functional mac

I was attempting to do a update my firmware and well now my mac mini has been rendered useless. When i press the power button, all that happens is the little led light turns on and nothing else happens. Now the only way to fix it is either to reprogram the EEPROM which isn't a possibility as far as I'm concerned or just replace the motherboard. It looks like I'm going to have to go to the genius bar and get the mobo replaced but unfortunately my warrenty expired in November and I do not have apple care. From what I've seen, the mac mini mobo costs about $500 (http://www.mac-pro.com/Mac-Mini-Logic-1-83-GHz-Intel-Core-Duo-661-4137). I think I'm screwed. Is the genius bar going to charge me a price higher than that of the computer itself for the replacement? Or could I get the apple care for $150 and then get the replacement for free? Or should I just hope to god that the mobo has a removable (socket) EEPROM and try reprogramming the firmware myself. Please help me out here, my parents are going to kill me!

+I was attempting to do an update to my firmware ...+
+I was just trying to restore the original firmware because I was having trouble starting up from an external HD. I have the mid 2007 mac mini 1.83Ghz Core2Duo (Mac mini 2,1). And I did indeed reset the SMU. Same results, the led goes on and the fans spin but nothing else happens.+
The more details you can provide us, the better the advice you will get.
What directions (URL please!) were you following to try to restore the original firmware?
(If I recall correctly, the only software available to roll-back a firmware was for situations in which a particular firmware update had failed. So I am puzzled as to what technique you were actually trying.)
As to solving the lesser problem of why you couldn't boot from an external, keep in mind that an Intel Mini would require a GUID partition map on that external drive for it to be bootable.

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