ya its def a bad conection mine did that try VERRY CAREFULLY to lift the coneters with razor of sumthin to make sure they touch the cable its cus u take ur psp apart alot like u said tape cable to mobo might help.
Lift them? Are you bad:censored: insane?
Okay, insert a little bid of paper inside the connector, and then insert the ribbon, that highers the pressure on the ribbon to the pins and thus giving a better connection, try cleaning the ribbon with some alcohol, and take a magnifying glass and see if some pins of the connector are bend, if they are, bend them down very slowly and careful.
Other than that, I see no other solution, so your screen might have died. If it is dead,
dealextreme.com <- click it.