Using VGA with FPGA

Hey guys,

I am relatively new to FPGAs. I'm trying to use my FPGA to output a VGA signal. At first, my screen kept entering power save mode, but I realized my timings were incorrect (vsync, hsync, etc). I needed a 25MHZ clock for 640x480 resolution but my board is only equipped with a 50MHZ clock. I created a PLL to generate a 25MHZ clock. Now, I am receiving the error "Auto adjust in progress". Any ideas as to how I can fix this problem?