Default p6210 power

hi all I had my p6210 repaired about 6 months ago it wouldn't power on they replaced charging circuit on it all was well until today it wont power on again , however I can get to download mode no problem , its been on charge for 2 days and no luck ,,, any ideas ?
Phone: Samsung Galaxy S5 G900W8 (rogers)
Android Version:4.4.2
Baseband Version: G900W8VLU1ANF3
Kernal: 3.4.0-1947824
Build: Omega V7.0 - XXU1ANG2
Launcher: Apex Launcher Pro

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