It seems then you have encountered two independent bugs:
1. The monitor reports that it can do 1440x900 and the driver happily gives it 1440x900 to chew on. The driver (or more correctly, the Xorg server) will pick the highest resolution possible (or the next to highest, I am not sure any longer). The monitor fails.
The frequency ranges in your xorg.conf, where do they come from? The monitor manual?
2. AGP makes the computer freeze, a very common problem (see for instance bug #133192). Can you try the AGPMode option? Older cards can be 1,2 or 4 and the newer ones 4 or 8. Please check the BIOS to see if there's an AGP speed setting.
It seems then you have encountered two independent bugs:
1. The monitor reports that it can do 1440x900 and the driver happily gives it 1440x900 to chew on. The driver (or more correctly, the Xorg server) will pick the highest resolution possible (or the next to highest, I am not sure any longer). The monitor fails.
The frequency ranges in your xorg.conf, where do they come from? The monitor manual?
2. AGP makes the computer freeze, a very common problem (see for instance bug #133192). Can you try the AGPMode option? Older cards can be 1,2 or 4 and the newer ones 4 or 8. Please check the BIOS to see if there's an AGP speed setting.