if you already have the xboxs you need to install a modchip regardless to see if it even boots. if it frags then you got a problem board that may not be repairable. and if one works and you have no modchip you could easyly flash one bios and solder it to the other and see if it boots that way if you are expect solderer
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If the bios is hosed, you need a 29 wire to repair or lpc mod to bypass.
not if you had a tsop socket, you could hotswap and recover a bad flash without using a 29 wire mod there is a tut in the pinned section for that.
in my honest opinion 2 xbox's for 50 bucks broken. not worth the money just cause people assume it's repairable and 9 times out of 10 it ain't, why else would you sell it.? <