By the way, i found what my operating system is, if that helps.
Mac OS X Version 10.5.2
Processor 1.9 GHz PowerPC G5
Memory 1 GB DDR2 SDRAM
Startup Disk Macintosh HD
More info:
Model Name: iMac G5
Model Identifier: PowerMac12,1
Processor Name: PowerPC G5 (3.1)
Processor Speed: 1.9 GHz
Number Of CPUs: 1
L2 Cache (per CPU): 512 KB
Memory: 1 GB
Bus Speed: 633 MHz
Boot ROM Version: 5.2.6f1
Serial Number: UNCENSORED
Thanks to anyone who has tried to or has helped so far.
EDIT: I found another symptom of bad shaders:
it's Night.inc. The Sun shouldn't have light blue around it.