Xubuntu monitor problem?

Fouchey

Honorable
Jun 26, 2013
198
0
10,760
I just installed Xubuntu on my desktop and it worked perfectly fine booting from the USB but as soon as I boot it up once installed it says "Not optimum mode recommended mode 1280x1024" I noticed that when I first boot up the monitor is in 640x480 and switches to 1280x1024 when I boot from USB but does not switch now. Any ideas on how to fix this? If you need any more details let me know. Thanks!