iphone 4s ran out of battery during ios7 update, now the phone wont start.

I

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started the ios7 update, fell asleep, battery ran out.

woke up in the morning and the phone was dead. tried to turn it on after it was put on charge for a few mins, all i get is a "boing" which kinda sounds like a sonar echo every 6.5 seconds. the screen is dark blue in the centre and black around the outside. i have replaced the screen myself 2 times, last time was about 3 weeks before this happened, so the guys at apple said they cant/wont help.

you guys/gals have any ideas?