Well, this could be a little tricky, since I just do not understand how I lost my warranty. I have the receipt from where I bought the phone, but the IMEI code is just not written on it, therefore I cannot actually prove that this is my phone. I can prove that I bought a Lumia, but not this Lumia, which is dumb, if you ask me, but takes my retailer out of equation.
Now, I assume that if I would take the phone directly to Nokia Care, this would be solved somehow, but, there is a big problem here: Nokia Lumia is not officialy supported in my country, which allows them to simply send me for a walk. I wrote to Nokia Germany 4 days ago, since that is where my phone is bought. They do not seem to bother. Meanwhile, my phone is stil dead, and nothing seems to work.
And, sidestory: I think somehow my dog ate my warranty. He also ate my work contract. Yes, I know, hilarious, but I was shocked when I saw how easily he can open the drawers. 
just had the same problem with my lumia, left it on charge overnight, work up this morning and phone was dead
I connected it to laptop and zune launched - it was also able to sync, but it still would not power up.
I then tried the reset by holding the vol down and power button and it came back into life and currently charging via laptop
my phone is on the new software too, 8107.12070 so this problem was supposed to be fixed, also i found it strange i could still connect to zune.
Anyway, Nokia / MS - another update needed..
I also cannot understand how this thread has been marked as solved 
Are Nokia even going to acknowledge the huge amount of problems this supposed 'flagship' handset has been plagued with since day one?
This is my first post on these forums, I have just had to initiate a second repair request after experiencing the problems detailed in this thread (namely that the phone turned itself off over night despite apparently having 13 hours of battery life left and now will not power on despite being on charge for the past 24 hours) the first repair was due to the phone not being detected by my PC, meaning I was unable to update.
Since the device was returned the PC still won't detect the phone but at least the device actually worked. For the past 24 hours the damn thing wont even turn on! All technological devices encounter problems, I appreciate that, be them computers, phones, TV's etc. but honestly, the amount of issues this handset has been plagued with since day one is simply unacceptable and to reiterate what many have said in this thread, a full recall should have been issued weeks (if not months) ago IMO.
Nokia seems to just want to brush these problems under the rug. After many years of loyalty to Nokia as a brand I have found my faith shaken, the Lumia is a lovely phone when it works but I can't help but feel standards have slipped drastically with this generation of Nokia's 'flagship' handsets. You only need look at the vast amount of threads detailing issues not only with the Lumia 800, but the 900 and 710 also.
Honestly, it's unacceptable and completely unexpected from Nokia who have been building quality devices for decades, I can't help but feel Nokia have rushed their new line of WP devices to market and that's something I never thought Nokia would be guilty of.
