Power issues with new Pi?

[SimpleSimon]

I am encountering some problems with my new Pi Rev B. It was working fine, but it started having issues where it would only illuminate the red LED. I tried a few known good SD and even re-imaged one. I tried using my serial cable, USB and bench top power supply to eliminate it as a possible problem. Voltage across the test ports was 4.2 or low. Any attempts to power the unit will make the voltage regulator hot to the touch. At this point, I am hoping for a poly resistor reset.

I was using a wi-fi adapter, keyboard and mouse and HDMI. Tests were done without anything attached. Any thoughts on what to try next? It won't even turn in at this point.

[adafruit_support_rick]

Have you tried powering it without the SD card installed?

[SimpleSimon]

I will give that a go this evening. It nagged on me last night! Hard to fall asleep when you have a problem in front of you. I attempted to power it up again this morning with a more robust USB cable, still no power indication other than an extremely hot voltage regulator.

[adafruit_support_rick]

Have a look at the RPi troubleshooting page, too.

[SimpleSimon]

Voltage across test points is 3.97.

Tried booting without SD card. No lights.

[adafruit_support_rick]

Do you get that voltage without the SD card inserted? You said you tried several different SD cards, so it sure sounds like the Pi is toast. Please email support@adafruit.com with a link to this thread to arrange a replacement.