16F676 programming problem

[ardhuru]

I can't figure this one out.

I
@ DEVICE PIC16F676, INTRC_OSC_NOCLKOUT,WDT_ON, PWRT_OFF, MCLR_OFF, BOD_ON,PROTECT_OFF

Internal oscillator and Master clear off is a combination that often does this. You need to use a Vpp-before-Vdd option in your programming software, if it exists. That should cure it, and reclaim all those chips you've tried, which are currently not (re)programmable.

Regards,

Anand