Chosen Solution

I just replaced the hard drive on my phone it was working perfectly. I turned it off to replace with a new SIM card and now it wont turn on battery was fully charged when I shut it down.

Hey Richard! Phones don’t really have hard drives, did you replace the motherboard? Or what part exactly? Plug the phone into the charger and see if you can get it into recovery mode using these steps: http://www.android.gs/how-to-boot-recove