Losing Brightness on XPS M1530 Laptop screen

My son has had an XPS M1530 laptop for a little over a year.  For the second time, the display has gone so dim it is not usable.  Playing with the Function keys and UP and DOWN cursor arrows doesn't change the brightness.

The first time this happened, his campus tech support gave him a combination of keys to press when booting up and it seemed to work.  Apparently, those don't work this time.

Does anyone know what might be causing the problem and whether or not there's a way to fix without having to invest in a new screen or circuit boards?



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