My iphone5s screen turned blue then grey. i've just updated it to ios7.1 two weeks ago. tried restoring through itunes but it says error 40. how to fix?

Hi, i've just updated my iphone 5s to ios7.1 two weeks ago, however, 4 days ago, my phone's screen turned blue then grey. I have tried restoring it through i tunes but itunes keep saying error 40. Can this still be fixed? or does it need a replacement?

Hey everyone in Apple world!
I figured out how to fix the flashing yellow screen problem that I've been having on my MBP!  Yessssss!!!
I found this super handy website with the golden answer: http://support.apple.com/kb/HT1379
I followed the instructions on this page and here's what I did:
Resetting NVRAM / PRAM
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
I went through the 6 steps above twice, just to make sure I got rid of whatever stuff was holding up my bootup process.  Since I did that, my MBP boots up just like normal.  No flashing yellow screen anymore!!   
(Note that I arrived at this solution when I first saw this page: http://support.apple.com/kb/TS2570?viewlocale=en_US)
Let me know if this works for you!
Elaine

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