Sounds more like it's crashing. You sure your disk (images?) are good? What else is running at boot? Any drivers? It might of simply crashed because something was in a memory location it normally uses.
Did you run Setup after changing video card?
Please post your complete system specs. Windows 1.0x should run on anything starting from the original IBM PC, as long as it has a graphics card, at least 256 kb of memory and DOS 2.0.
btw, how long did you wait after the splash screen appeared? Maybe it's just slow and takes some time..?
The setup utility is on the Setup disk and I think needs to be run from the floppy.
15 seconds should be enough time.
this is my image file, i dont see any setup file