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 :( ?
When only the red led lights, it usually indicates there's no boot record on the SD card. If you are certain you created the new image correctly, make sure it is firmly inserted. I had one Pi where I had to hold the SD card firmly against the contacts for it to boot correctly.
I've downloaded the latest version of wheezy, did the same old steps and it worked out! i frankly don't know how or even why it's got broken in the first place.. I'm just glad that it worked out finally and hoping to maintain this state. thanks for your responses guys
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.
I found the B+ model to be a bit annoying in the way the micro sd cart is placed... when you push it up against something (i.e. a Lego case you build) it might release itself.