Raspberry PI 3 Dead

Reading your pi3_wifi_test.tiff screenshot you're transmitting at 1496dBm which as you know a 5V 4A supply cannot achieve.

So I'd say there are driver or some other build issues in the software currently that somehow you have hit. Did you make any unusual modifications to settings that perhaps the driver is getting confused with? Anyway for now, I suggest to use an external 802.11 USB adapter as with your Pi 2.

I have seen other issues with the 802.11 on the Pi 3, but not the one you have seen. It looks like the 802.11 capability is not fully ready for prime-time in the software, so it might be worth waiting for an update or two.

EDIT: For what its worth, I configured from the command line (the instructions are on the raspberrypi.org site). I did not use the graphical desktop environment. Perhaps there is an inconsistency between what the GUI displays and what it configures, leading to some error with a config register which causes it to configure itself to an impossible power level. This is speculation of course.

EDIT2: I just compared, and my Pi 3 (which does not suffer the wireless symptoms that you mention) also displays 1496dBm. So it seems a (possibly [not sure] cosmetic) bug in the driver. An external 802.11 USB adapter correctly showed the configured transmit power to be 20dBm. I cannot see anything else unusual in your iwconfig output.

Ok try switching channels:

sudo iwconfig wlan0 channel N     where N is 1 -11

Clem

Yes, 1496 dBm is not even close.   20 dBm is = 100 milliwatts at 50 ohms.  I knew 1496 dBm was bogus.

Seems like there are still issues. and we will be looking for a update to fix.

thanks for your help

tried that already.

Try turning off power management. I have seen quite a few wifi complaints solved by turning it off including mine.

Exactly what did you do and what image.  I am having the same issue.  The green light flashes twice and the screen is stuck on the rainbow colors

That is what happens when you have an OS-image on the SD card that was upgraded. A fresh OS-install of say "noobs" will allow the rpi3 to boot.

I have not investigated the root cause: The upgraded system should be identical to the fresh install, but alas, it isn't.

Probably the power output of a small sun so most likely wrong

You can't imagine how fast the "expressable numbers" grow. IIRC there are about 10^80 atoms in the universe (apparently give-or-take a factor of 100). 1496dBm would be on the order of 10^75 W, or on the order of 10^49 "small suns" (counting ours as "small" and using 4*10^26 W as its power output.)