Black screen of death occurred on my iphone 4?

Few days back i bought a new iPhone 4 and today black screen of death occurred on my iPhone. Now my iPhone is fine. I pressed the lock button and the home screen button together. I just want to know why the black screen of death occurred as i didn't drop it or put it in water and it is new as well. Is it normal? Is my new iPhone fine?

Is an American iPhone the same as a UK iPhone?

Like are all the internals the same? And would an American iPhone work here in the UK if you bought it unlocked? Everyone says all iPhones are the same round the world and I think it would work, but I was just confirming.

How long can i keep a red devil cichlid in a 50 gallon?

For those who have a iPhone you can see the picture I uploaded but my red devil is and 2 inches and he or she is in a 50 gallon how long do I have before I have to upgrade or do i even need to upgrade and to what size… And can by looking at the picture can anyone tell me the sex and age of my fish…

TEENS: What shoul I get iPhone 5 or 5s?

Well I'm planning on buying the iPhone 5 but now that the 5s is coming out I don't know what to get, When I watched the video for the iPhone 5s it had NO new serious feature just the (FINGER PRINT) thing and that's it, So what's your opinon? & Also what company is better for the iPhone 5 I was going to get either (Virgin mobile) or (T-Mobile) what's the difference?

What should I ask as a graduation gift?

I just graduated from university and my father wants go buy me a graduation gift up to 500 dollars. There's nothing I really need right, except from money but he says he really wants to buy me a gift.
I need a phone so I thought I'd ask for an iphone because I never had one, but a phone is something that I won't have in 10 years. What would be a good gift to ask that would last for life?

Sync In iOS 7 GM Using Windows?

I Have Successfully Installed iOS 7 GM In My iPhone 4S, I Had Registered For UDID And Did It In Legal Way! Between My PC Is Windows 7 And iTunes Doesn't Work Anymore! I Don't Find iTunes 11.1 For Windows. Any Alternative Software? Help Me. I Need To Copy My Musics/Videos To iPhone!

Added (1). Okay Guys! I Ihave Found An App Called Syncios! This Is Same Link iTunes! This Is Awesome! Anyway Thanks!