With about 6 more months of graduate school ahead of me (stupid summer class), I'm hoping my 3.75 year old 500Mhz iBook will last me until I am once again gainfully employed. I can't afford a new computer right now. In the last couple days, the screen on my iBook has twice suddenly gone very dim for no apparent reason. The display was still working, but the image was barely perceptible, like the screen is on the lowest brightness setting. However, it wasn't the brightness setting as brightness was set to maximum. When I tried to change the brightness with the keyboard the screen remained dark (also meant the computer wasn't sleeping). However, after closing the lid and reopenning the computer, the screen was back to normal. Does this seem like a bad sign? Is my reliable little iBook on its last legs? Or is this just computer quirkiness that I should expect out of an old laptop?