This morning I found my iMac G5 was accidently left on all night. The screen saver was running so I didn't think there was a problem. However, my screen is now noticeably darker than it was yesterday. I've checked all the settings and they all appear fine. The brightness is set to 100%. My co-worker has the same iMac as me and her screen in set at 50% brightness and still looks brighter and crisper than mine. Any ideas? I've restarted, shut down, left off for about 10 minutes.....no change.