My Raspberry Pi worked perfectly when I recieved it. I loaded a 4GB SD with Raspbian “wheezy” powered by power supply from RS. I played around with it, updating it, playing arround with screen settings. Did a reboot, and suddenly it would not boot.
I wrote the image freshly onto the SD, but it didn't help. The red light goes on, but nothing else happens. I measured the voltage on the board and it looked perfect, 4.97V. I tried another SD, I tried another power source, and I tried without anything connected besides power and SD, but still no activity, just the red power LED.
What can be the issue?
I tried the update from the raspi-config menu just before rebooting. Does this only change data on the SD? Or does it actually flash new firmware to the Raspberry Pi?