Pi wont boot

[usx8]

Hi, I'm new here and I hope this is the right area. The other day I bought a new SD card for my RPi (16gb class 10) and formatted it. I then put noobs on it and tried to get it to work. I formatted and extracted the files onto the card 3 times and I could not get it to boot. I was using the composite out, and I tried with ethernet connected and disconnected, as well as usb devices connected and disconnected. After seeing that the noobs SD was not working, I checked the wiki to see if the card was compatible, it was so why it doesn't work is a mystery to me. However, I also have another SD card with Rasbmc on it. This has worked for months, no problems, but after trying the new card, this one no longer works. I tried unplugging all peripherals and ethernet (through composite again). The error message I was getting was:

Code: Select all

kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(179,2)

A quick search of the forum said that by changing part of the code (in the cmdline.txt)

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mmcblk0p2

to

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mmcblk0p6

my problem would be solved, however this just changed the message to

Code: Select all

kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(179,6)

So now both of my SD cards do not work, and I have no idea why. Basically I'm looking for
What went wrong with the new card?
What went wrong with the Rasbmc card?
How do I install raspbian on the new card? (16gb one, with or without noobs)
How do I fix the Rasbmc one?
If any more information is needed just let me know!

[shabuboy]

Yesterday I built my first Raspbmc and it worked fine for about 8-10hrs. then late last night, got the same error.

Ideas anyone?

[Genius23008]

This can be caused by your SD card.
Class 4 cards work best with the Pi (anything higher is sometimes problematic).
By the way, changing the code for me stops my Pi from booting...?

[abishur]

I don't suppose this was a kingston 16GB Class 10 micro SD card was it?

http://elinux.org/RPi_SD_cards#Working_ ... g_SD_cards

If not, I mainly see this issue with a corrupted SD card and more often than not it's caused by too high an overclock. If that's the case than re-installing it without overclocking would fix the issue. Once confirmed slowly increase the overclock until you get the issues again and you'll know the max overclocking your pi can handle