To hard reset your Samsung A877 phone enter *2767*3855# '''BE AWARE THAT THIS WILL DELETE ALL YOUR CONTACTS, MESSAGES and PICS ETC. SO back your stuff up ahead of time. '''
There is another reset but I do not think that this will work for you since your screen does not work. [http://ars.samsung.com/customer/usa/jsp/faqs/faqs_view_us.jsp?SITE_ID=22&PG_ID=557&PROD_SUB_ID=558&PROD_ID=1606&AT_ID=151388|Info here.]
To reset the handset, to the factory default settings, follow the steps below:
From the standby screen, press Menu
Press Settings
Press Reset Settings
Press on any of the following to check their boxes:
All: Sound Profiles, Display & Light, Phone and Alarm settings will be returned to default values
Sound Profiles: Only sound profile settings will be returned to default values
Display and Light: Only display settings will be returned to default values
Phone: Only phone settings will be returned to default values
Alarms: Only alarm settings will be returned to default values
Press Reset
Enter the password default password is “0000”, then press OK
If prompted, Enter the password again to confirm then press OK
Press Yes to Reset the handset's settings to the factory defaults
If the reset does not work, you may just have to look at your digitizer and possibly needing a new one. Good Luck and let us know