Need Help, kinda Desperate (T4I won't boot)

[Walter Schulz]

You removed the battery and inserted the battery again after inserting the card?

[Oliver94]

Yes, many times

[Walter Schulz]

Well, you may try other cards. But I don't have high hopes, though.

[Oliver94]

Woah, I got 2 class 4 cards and now it works... Can't understand why yet haha. Sadly the "dead" sd card was a 32gb class 10

[Walter Schulz]

Well, that's good to hear.
And if it is just an 32 GByte with label "Class 10": 10 MByte/s write rate are far away from 41 MByte/s (limit for T4i). You will get Class 10 cards for about 10 Euro here.

Still raised eyebrowes about the card you used before. First time I heard about cards working on Windows but unable to start inside the cam.

[Oliver94]

Can't believe this, thank you all for your fast replies. It's working now with a new SD, no problems at all!