I changed my resolution and then rebooted. I got the following message: Frequency out of range. I have XP home loaded on the pc. I had to use the on/off button to restart and then wanted to go into safe mode to change my resolution back. However, after pressing f8, safe mode would not start. I repeated on/off, f8 several times with no luck. I then tried booting with my XP installation disk, still no luck. Any suggestions?