Thanks, you're right about the standby voltage, but there's a resistor fed directly from the 3.3v standby, the other end connected to the switch which is then grounded when pushed, I was thinking maybe a trace from the standby rail had corroded so there was no standby voltage to the resistor acting as a constant short at the switch, I've checked, I think, and this isn't the case. I did remove the drive and shorted the tray closed pins and the same problem persists. I did suspect the switch,but tested it and it seemed fine, you're right about the possibility of it being a hard to detect defect...

No, I checked the voltages that should be present on the regulators from a diagram and they are all right, only, my board revision doesn't have the 2 standby regulators for 3.3v and 1.8v so I don't know where the standby voltages are generated. I believe it's a Tonasket board. I'm beginning to lose faith now. I just checked and there doesn't appear to be a short between the regulators and ground.

I did look at the schematics, that's how I know the DVD button and the 3.3v stdby are linked and a missing 3,3v would cause the exact symptoms.

I'm absolutely confident it's a failure of the 3.3v standby rail. But where?, is the question. I'll take some voltage readings and test for shorts in the rail. I bought a Series X just so I could continue to play my 360 games. But, I'd rather have the 360. I was just about to RGH it, too.

Hi,
Thanks, I know it's not the drive. I'm now wondering if maybe the 3.3v regulator may have blown. I'll check it today if I get around to taking the thing apart again.

Hi,
I trained many years ago as an electronic engineer, in the 80's, but never really went into the field. Things are a lot different these days, components the size of specks of dust instead of family cars etc. Anyway, I have a strange problem with my xbox 360, I noticed one day that it would switch itself on and the disc tray would repeatedly open and close. I searched the internet for information, to no avail. I did find some circuit diagrams, it appears as though the machine thinks the ODD button is being continually pressed. I found the section where the eject button is and figured...