my compaq desktop computer will not power on and there is a green blinking light on the back of cpu

I had Highspeed internet from a cable company, and now that I turned it off. I cannot locate my icon that tells me what available networks are close by. My Icon is gone from the task bar. Can some one help me please?.

Thank you.  

Can you help me on how to prevent computer related eyestrain.

Thanks for the help.

I wish to know how can I use remote desktop.

Thanks in advance.

I wish to know how can I lock a workstation.

Thanks for the help.

Can you guide me on how can I custom build a gaming workstation.

I wish to know how can I custom build a workstation.

Thanks for your time.

Can you help me on how to connect a workstation to the server.