Hi All..
One week ago I created new hana instance. Its work fine and I did some exercises through Hana Studio and through using Hana Web IDE.
After 4 Days the AWS instance show error that license is expired....I created and I installed the new license key through hana.
it works fine after installing the new key...
I usually stop the instance when i am not using.
After a few days I started the instance to start work, But it is not working now ..
I tried to re install the new license key, but it showing error as "no database connection".. 
please help me, whether the new license key is a cause for this problem...
If this is the problem, please help me to figure out of this...
Thanking you...