dani. If you can verify your PC is working ok and capable of driving a known good monitor, you will at least narrowed down problem to your white screen lcd! Always state the make and model in the text body of your post to fixya. I usually only do BLACK screen fails, but here goes anyway. The vga input to LCD digital output interface board is telling the lcd panel to turn all pixels "ON" !! If monitor worked ok the day before--then it should work fine today? NO! something has changed! When strange things start to occur on lcd panel I would first suspect the "switch-mode-power-supply" as the trouble maker. If you haven't a clue as to how a SMPS does what it does, then you will need to find technician or TV repair shop that also knows forward and backwards all about lcd monitors. I do suggest that you visit youtube for videos on lcd monitor disassembly and LCD monitor repair so you can see what is inside a typical unit. FYI visit www.ccl-la.com/badcaps.htm
Well, anyway, your CCFL backlights STILL work!!
Although most of my responses are to Black/Blank screen you may find other options that will suit you a little better. 12fixlouie