Take the 2-minute tour ×
Raspberry Pi Stack Exchange is a question and answer site for users and developers of hardware and software for Raspberry Pi. It's 100% free, no registration required.

Power is good - I've tested with a voltmeter. According to this link, the SD card image is not written properly yet:

The Raspberry Pi cannot find a valid image on the SD card. Check card is inserted correctly.

The OK LED does flashes once. Is this to be expected if SD image is bad? I think this is because I took the SD card that was formatted FAT95, and dd is choking on it somehow. I will delete all /dev/sdb partitions via fdisk.

I'm pretty sure this will get the SD card happy again (at work now - so, have to wait a few hours to test), and dd can then write the image cleanly to a blank SD card. Just curious if anyone knows for sure that OK LED does flashes green once in such cases while the Pwr LED stays solid red, but no video, when there is bad SD disk image inserted.

Thanks for any ideas....

share|improve this question
    
Welcome to SE. Please see raspberrypi.stackexchange.com/faq#signatures and meta.stackoverflow.com/questions/2950/… –  XTL Dec 11 '12 at 7:45
    
" I think this is because I took the SD card that was formatted FAT95, and dd is choking on it somehow. I will delete all /dev/sdb partitions via fdisk." Deleting the partitions on the SD card will not help. If the card is still formatted as FAT, then you are going to have to reformat it to use a Linux filesystem, such as ReiserFS (not recommended), or an extended filesystem such as ext4 (highly recommended). Out of curiosity, how did you write the image? Did you use the Windows flash utility or write the image using dd from Linux or OS X? –  InkBlend Dec 11 '12 at 18:25
add comment

4 Answers

In my experience, Yes, if the green LED flashes just once then stops, this indicates that the SD card is corrupt. Sometimes it doesn't even flash once, though.

share|improve this answer
    
True! I was able to dd via a powerbook; linux may have some issues with previously formatted SD cards, and couldn't get dd to work on it. –  Patrick Dec 12 '12 at 2:59
add comment

I swap cards all the time, try writing another card with the win32 disk imager using one of the distributions like the debian squeeze one. I have 16 pi's and originally used the element 14 distribution but any 16/32 Gb card from sandisk works 2-4 times faster. None of my cards had any issues.

share|improve this answer
1  
That's not what he asked. He wanted to know if the flashing-once green LED means that the SD card is corrupt. Mind you, I'm not surprised at the confusion. –  recantha Dec 11 '12 at 6:20
add comment

Which Rasberry have you got?
And wich distribution?
I tried starting an new 512Mb Model B with an old rasbian image. No go!
Downloaded the newer 2012-10-28-wheezy-raspbian.zip and it booted up. Just saw there is an even newer version:

2012-12-16-wheezy-raspbian

share|improve this answer
add comment

I have found occasionally that corrupt SD cards sometimes have the green OK LED flash once at proper brightness, and then have the appearance of being extremely dull (very hard to see, but not quite off), almost looking like a light bulb filament when there is not enough power to light the bulb properly.

I presume this is due to it coming on for an extremely brief period and then going off again at a regular interval, quite why it does this though I have no idea (I have seen three cards do this now across two different Raspberry Pis).

share|improve this answer
    
This is probably more useful as a comment, than an answer to the original question. –  kolin May 15 '13 at 7:38
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.