After I replaced the cracked screen I am having power problem with my iPad 2. It will not turn on by pressing the power button. But if I connect to my macbook pro it does power on and everything looks and works fine. When I disconnect from the laptop though I cannot turn it off with the power button, it has to timeout which is set to 2 minutes in General/auto-Lock. Then if I want to turn it back on all I have to do is press the Home button. It looks like the power button problem. I do not see any visible damage in the area of power button, power cable or volume control area except there is a very thin black wire running across top edge which is not connected to anything. I do not know what it is for. Any help will be greatly appreciated.