First off, I lost my manual reflasher(hooks up to the pc through the printer port).
From this we'll assume you're referring to a Matrix mod
Second, Xbox froze for almost an hour... being an idiot i restarted it to see that there is no load screen and an xbox red light blinking error
Well..if there is no load screen (flubber animation) and youre use to seeing that, then the best bet is the bios isnt loading (ie: you'll need to remove the matrix and reflash it using the programmer that you lost). You could remove the chip and try to boot to the original os to make sure its not a hdd/file problem (course, the hdd would have to have been locked while the mod was on).
You can hit the BST forums and look for a programmer (I know alex548 had one as I sold it to him months ago) or you can get yourself another chip (if you dont mind soldering, you may find a chip cheaper than a programmer)