help me guys, im really desperate :( my RPi out of sudden stopped booting whenever i plug in the power cable it only turns on the red led! nothing more than that.. i've checked this site to troubleshoot it, inserted the SD card in my pc card reader , did a format and wrote a raspbian image on it but still no boot! what's the problem here?! need a new SD card? or a new raspberry :( ?
I had a similar issue only red coming on and occasionally i could get it to boot, which indicated it wasn't corrupt..
I found my SD card was a bit loose and not making good contact with the pins. I used a strip of thin plasticcard on top of the SD card to make a really tight fit. Seemed to do the trick.