Arduino Ethernet blinking pattern

Hello,

I'm playing with various Arduino's at the moment and today I noticed that my Arduino Ethernet didn't work anymore. They are all for the same project so they contain mostly similar sketches. I figured I have an old sketch on the Ethernet and I uploaded a new one. After a few tries because of errors (device sync errors) it did accept the sketch and I can continue to upload sketches now. The weird thing is that my code isn't executed.

If I upload the blink sketch and hook up an LED I see 3 flashes on the LED followed by a second of inactivity. The pattern keeps repeating. The reset buttons still works .. Does anyone know what this means? Did I break the Arduino some how? It had basically been sitting at my desk :frowning: