Odd boot logo problem - resolution not supported

[Gunbuster]

Hi all,
I'm getting a resolution not supported warning from my monitor on boot up.
The bios screen shows, then the dos style progress bar, but the loading windows XP screen fails to show. The logon screen appears, I'm not to bothered by it, however I would like to know why it is possibly doing it.

OS: Windows XP Pro SP2
GFX: ATi Radion 9600XT
LCD: Samsung 172b (dsub)
System: Soltek EQ3702
CPU: AMD XP 2500+

[unrealrocks]

Does it do it on any other monitor?