Inspiron 1545 screen flickering

I have a 4 month old Inspiron 1545 and recently the screen has suffered from an intermittant fault, whereby the screen either flickers or goes completely black. It does this both plugged and unplugged. All the programs are running when it blacks-out and seem to stay running, with the screen returning to whatever I was previously doing. Is this a wiring fault? Does it need to be returned under warranty? I am concerned if I do return it that the technician will not be able to replicate this intermittant fault.