Here's the solution that may help fix and repair Nokia 2700 classic Power problem. This solution is for Nokia 2700 classic that shows charging indication but doesn't get On or power up when pressing the power key switch button. Although this solution came late but still there are many who are looking and requesting this solution.
Nokia 2700C Power On -Off key Switch Line Tracks
There is line test spots near the Keypad filter IC that can be easily check the power/ end key line paths, just apply a jumper wire if that line is open or cut.
If the said line spots is okay, you may need to check and replace the upper Keypad Filter IC