Client pc not connecting to main server

hie guys can somebody help me ,its been a month now im using multiple pc through sambapos everythng worked smoothly until yesterday my client pc doesnt wanna connect saying connection string is wrong but its the right string…i checked the sql server agent but its not running tried to start it but its not starting…is there a way of fixing this? need your help pls

Never experienced it myself so it is hard to guess without an error message but trying repair function of SQL Server setup may help.

Reviewing windows event log may also give an idea.

Ensure you have latest SambaPOS backups before attempting to fix that.

if I go to the control panel there is a lot of sql programmes installed so I dont know which one to repair…which one is specific for sql server agent

@mj.mzuks look here for some ideas to try.