After shutting down I wait until the screen goes blank. Only a red LED is on at the time I pull the power. Didn't try to measure the voltages at TP1 to TP2... I will measure the voltages and also try a different SD card and see how it goes. thanks, Andreas After you issue the shutdown command are yo...

A while ago I bought a Raspberry PI (Model B). I downloaded an image, copied it onto an SD card and tried to boot it. After finding and using a suitable power supply, I managed to get it to boot. However, if I try to boot the system after shutting it down and removing the power it won't boot again. ...