So I have been using an external display with my Macbook, a Dell E207WFP. This has worked great for a while now; usually, I would just power up the laptop with the monitor connected and just hit "Detect Displays" from the menu bar icon. My monitor and Macbook screens would automatically adjust to the highest resolutions possible, and my resolution on the Dell would always register at 1680 x 1050. All of a sudden, this seamless integration of external displays stopped working and every time I clicked on "Detect Displays", the Dell monitor registers at a default of 800 x 600. Worst of all, the option to display at 1680 x 1050 has disappeared and the highest resolution I can work with is 1400 x 1050. Does anybody know what's going on? Any possible solutions? I want to be able to return to the beautiful 1680 x 1050 resolution if possible. Thanks. Specifications: Macbook 1.83 GHz Intel Core Duo, 2 GB 667 MHz SDRAM, OS X Leopard 10.5.4.