Suddenly, phone just stopped working at all. None of the soft reset combinations worked. I tried for several hours trying to make iphone alive again, but still no result.

The first sign that you’ll need hardware reset is that your iDevice is not recognized by computer at all, no matter what type of OS you’re using. I’ve tried connecting it to Mac/Windows7, and iTunes, as well as other jailbreaking software didn’t see my phone.

Luckily, there is a pretty cheap trick which will allow you to boot iPhone again is disconnecting it from power source, i.e. from internal battery. To do that, just follow these steps:

1. Pull off 2 screws at the bottom:

2. Disconnect battery, after removing the screw:

3. Connect it again, and repeat the process in reverse order.

p.s. Disconnecting iphone from power source should probably work on other iphone models.