Hi April, Thank you for your post. When you say the bulb was replaced, do you mean it was literally just replaced and the projector has not worked since? If so, make sure the lamp hatch is securely in place as the projector will not strike without out. If it has worked since, but has now started flashing, then please record the number of flashes you see before there is a little pause and it flashes again with the same number before the next pause. Next make a note of the projector serial number on the back of the unit and call your Technical Support team to report the issue.