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Found two X-boxes in the trash, one booted fine (2002 model), the other not (2005). The one that did not start had a USB-port sticking out on a cable on the right side - so mod of some kind Cecking... it has a homemade fan hack (edges cut off a larger fan to fit it and taking power from harddrive connector), USB connector in parallel with control port 4 and a DUO X2 chip hooked to a defective three step ON-ON-ON switch button on the back. It doesn't say GS on the main chip (it's a three IC version with 29F080 flash) - like the one I found here. Found installation instructions for the DuoX2, understood that this is a v1.6 board, chip seemed to be installed OK, fixed the switch - which seems to require just a plain single pole ON-ON version with three wires - the other three pads on the original switch aren't hooked up to function as far as I can see - unless it's some very special original switch. Seems very likely it just shifts the top address-pin on or off - but I didn't check. Had the chip out, Xbox started normally, could start a game (thrown with it), harddrive had saved games, also found out that it should start normally when starting it with the eject button - yes, it did. If having the switch in one position I get three restarts that ends with flashing ring yellow/red. Ejecting still works, DuoX2 flashes steadily red once per second or so. In the other position DuoX2 flashes and eject LEDs are constant green for about 15s then turns to red flashing. If pressing eject the disc stops (if any) but the disc stays in (not ejecting). It seems it's trying to read the disc but nothing interesting happens. Tried downloading and burning "TruHeXen 2021.iso" to DVD-R with imgBurn. Before I waste the entire stock of DVD-R burning them in different ways, is there a trick to start it or should it boot on any Xbox? Scrolling through the iso in a hexeditor seems to give the impression it's legit. I lifted a png from the .iso - says Heimdall's Xbox Engineering Disc 2021 with a metal frame and a screw in each corner. Also fetched TrueHeXen2020.iso - same in 7zip, also has nothing to show if mounted in Windows. I'm thinking flash chip is messed up and perhaps it can be flashed to a working state...? I can desolder it and program it/check it with an eprom-programmer - if I have something to put in there. I can make a reinstall of the chip as well - if that's a plausible problem - looked OK though, don't know what problems might be hidden though. Any ideas? Thanks.