Dell 3200mp projecto shows diagnal color lines

SOURCE: Dell 3200mp lamp

are both of the lamps the same? have you installed it correctly in the socket. you might need to do a cold start for your projector. unlpugg it and try to wait for 5 minutes before plugging it again and turning it on. one your projector detected that a new lamp is intalled, it should work fine now. but if its still not working, you might want to try and replace the new lamp again. sometimes this happens.

hope this helps.