random: Unblocking is initialized

How stiff is your power supply?

Well said!

In message , Wayne Chirnside writes

Not sure what you mean by "stiff", but I've tried it with two different supplies, both rated at 2A, and in both cases I get the same result.

Adrian

"Stiff" means that there is very little variation of output voltage as the load changes from zero to 2A (in your case). "Well-regulated" if you like. It's also possible that the power supply is OK, but the leads connecting the power supply to the RPi have too great a resistance, i.e. they are made with cheap, thin conductors.

Once I experienced a similar problem after a power glitch on boot, and was able to recover using the restore file system in the boot menu. My guess is you are experiencing a corrupted file system. Buy another TFlash card, Burn an Operating System onto it and try booting the new card. I use several TFlash cards. The worst that can happen is you can use the new TFlash card for backup. The best that can happen is however expensive sad news indeed - your RPi2 board has failed and needs to be replaced. Hopefully it's a system software glitch.

Troubleshooting: Do you know anyone with another RPi2? If it were me, I'd swap the TFlash card into a known good RPi2, and while you are there swap a known good NOOBS card into the suspect RPi2, then see how it boots. There are three outcomes, the problem follows the TFlash card, the problem follows the RPi2 board or the problem vanishes.

Ah, thanks for the explanation.

I'm not in a position to comment on the stiffness, but I know a man who can (but not until next year).

Adrian

In message , DisneyWizard the Fantasmic! writes

I don't have another Pi 2 to hand, so I can't try that out.

I may have another card somewhere, I think I bought two, so I'll see if I can find that one, and give it a go.

Thanks

Adrian

WHS.

Things work until they break or you change something. If you've not changed anything then something has broken. Personally, I doubt it's the PSU if it's a switcher. They normally fail catastrophically in the chopper transistor or input capacitor. Most likely is a corrupted SD card image probably caused by a power interruption.

I'd read about SD cards failing but never experienced it till recently when I had a battery connector go intermittent resulting in a gubbed SD card. Reformatting and copying the image back restored normal operation. I have a Linux laptop with an SD card slot so taking an image of the card and restoring it is trivial using DD. I've never tried it on Windows but you could use Cygwin though I'm sure there'll be a dedicated Windows app for this considering the Pi's populairty.

Win32DiskImager

In message , Adrian writes

I found the other card, and I plugged that in, and it works. So it looks as though there is a problem with the old one.

Adrian