what was it? I please don't make me skim through 45 pages 
https://chdk.setepontos.com/index.php?topic=12321.msg123736#msg123736
I'm getting a correct boot-up when the USB cable is plugged in...this camera is weird.
What is happening when you use an official build? No-one mentioned startup problems when USB is connected.
Although an earlier generation, but my ixus150 boots normally in presence of a USB connection.
I once tried an ixus140 (iirc) and it performed OK, so this is new also for me..but then again it has been a while since I last played with CHDK
regarding that post you linked:
Actually in the crash itself, the camera extended the lens to far to a point it couldn't retract. I tried rebooting normally a couple of times, but it kept giving the lens error and not retracting. I left it on its back overnight. Next morning I retried and it retracted normally! As my washing machine was on and it vibrates the floor a lot, it might have shaken the lens motor back or such. Or I just got lucky...
I experienced this very same issue today, it happened like this:
- remove power to camera
- insert usb
- give power to camera
< camera tries to bootup, fails and extends the lens a little more than it was before >
- goto "give power to camera" a few more times
< at this point lens is far out >
- now the lens cannot retract anymore with or without chdk active
- fiddle a bit with power on/off
- get the camera to finally retract the lens
Now, after building and running current trunk without "init_required_fw_features()" this didn't happen anymore..
At this point I'm not sure on what to think, I would like to try this very same procedure on another camera (same model), hopefully a friend will give to me in the next days..
