[Khalid]

Hi,
You haven't said if you tried toggling the step input as the motor will NOT hold on power up until it see's step input (assuming enable is already at ground).

Many time with zero results.. I touch the +5V wire at Step pin many many time but their was no response from the Motor... I am puzzled why motor not holding torque... Also i have replaced so far 4 PICs considering their might be problem with the PIC but...

Have you used your programmer to download different hex onto PIC's for different projects and did they work? or is this the first time you have tried to do it?

Yes I have used this programmer with success.. recently i programmed the 18F4550 PIC for "Steve Rotary Indexer", He has posted his HEX file with all the configuration bits and the circuit worked like a charm...

[amishx64]

Are you sure that the issue isn't with the driver chips? It sounds like they are either not enabled or they are dead.

When you killed your first PIC, where the driver chips also on the same board?

You may want to test one individually.