Hi, thought I'd share a quick story about picking up a faulty xbox
I got it to work easily by replacing the 5 x 1500uf capacitors (common fix)
I was surprised to find a different modchip than the good old aladdin. It is an Apple-X VI which is supposed to have 2 x 512kb banks according to https://www.ogxbox.com/forums/index.php?/topic/17-modchips-generation-3b-from-xbox-scenecom/
However I could not flash a bios any bigger than 256kb on each of the bank. Not a biggie as the onboard tsop can support 1mb.
Booting from the onboard tsop by pressing the eject button and from the modchip by pressing the power button.