HD7 reboot automatically & boot loader problem

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Hi guys, I bought my first WM7 phone more or less a week ago. Returned home I updated my hd7 and it was ok.. Using the phone I saw that it reboot himself automatically sometimes and other times after the reboot he says me "Storage card not working"... I though that the problem was the update... I tried to downgrade but I failed this operation because I've never used a WP7, I had an iPhone... So.. I tried other times to downgrade but nothing.. Now my pc don't recognize the phone in boot manager mode (the colored screen) and it's not written USB or Serial on the bottom... I think I did a bad think...
Can you help me to repair my mobile?! What do you think i have to do for solve the rebooting problem?!
I also colled Htc support and they said me to send them the phone but I can't stay 2 weeks without my phone... My mobile is already under warranty for more or less one year.
Thank you very much to all.
P.S. Sorry for mistakes on my english hahahh

I had the same problem. It was when I changed my SD Card for 32GB. But the card were too slow. I changed the SD for another ( and faster) 32 GB SD, and it correct the problem.
But, when you change the SD card, you braek the warranty.
If you want to keep your warranty, you have only 1 choice : send your Phone to HTC.
Sorry.

Originally Posted by TheBexFr

I had the same problem. It was when I changed my SD Card for 32GB. But the card were too slow. I changed the SD for another ( and faster) 32 GB SD, and it correct the problem.
But, when you change the SD card, you braek the warranty.
If you want to keep your warranty, you have only 1 choice : send your Phone to HTC.
Sorry.

wich type of SD (the faster one) did you used? Can you say me the model and the type? Wich class ? Thank you. I hope it will work
I tought that the problem it's caused by a bad Sd as you said. I don't know how to do.. I'll ask to my friend that is a geek a solution.
But please, give me the SD card model

great seryeeeeeeee

wich type of SD (the faster one) did you used? Can you say me the model and the type? Wich class ? Thank you. I hope it will work
I tought that the problem it's caused by a bad Sd as you said. I don't know how to do.. I'll ask to my friend that is a geek a solution.
But please, give me the SD card model

please, give me the SD card model