Yours is staying on Grey the system is waiting for the Hard Drive or Floppy Drive..
Unplug the Floppy Drive and Hard Drive, do you get a kikstart prompt screen?
If the screen remains on any of the following colors on bootup, here is what they mean: -
-Black
Opening screen
Initial Hardware tests passed
Initial system software tests passed
Final initialisation test passed
-Red
ROM error, reseat or replace Kickstart ROMS (this can also be caused by worn insulation covering the back end of the pins that connect an IDE cable to a hard drive, aka short).
-Green
Chip RAM error
-Blue
Custom Chip(s) error
-Yellow
68000 detected error before software trapped it (software or hardware error
