If the motherboard was turned on when the Kickstart chip was installed reversed, the VCC (+5V power) was fed to the chip's ground pin and probably broke the chip. When you put the chip back in correct orientation and turn the computer on, you probably either get a red or black screen, depending on how bad the Kickstart chip was damaged.
Without the kickstart I would have never thought about doing this...
What have I to expect?
You will only get a black screen. The computer doesn't show anything on the screen or click the floppy drive if there is no Kickstart installed.
