After restarting the system, WAS for ABAP is not able to connect Database

Hi,

I installed Sneak Preview SAP NetWeaver Application Server for ABAP in Local system. After restaring the desktop,I am getting following errors-

1. SAP-Basis System: Initialization DB-Connect Failed, Return Code 000256

2.Database: Database error -10709 at CON

3. Database: > Connection failed (RTE:Database name is missing)

Here, i have not done any thing except restarting the destop. before restart every thing was working fine.

please give me some clue, what may happed to the Application.

Thanks

Anil