This instant camera from Fujifilm now boasts a slimmer and lighter body than previous revisions. The Mini 8 helps the photographer by alerting them the recommended aperture. It also has a High-Key flash mode which helps the photographer attain soft portraits for a stunning look.
According to the camera's user manual, the batteries should be replaced with the camera switched on, which appears anti-intuitive because with most cameras exactly the opposite is recommended.
Quoting from the troubleshooting section of the manual:
Replace the batteries. only when the power is turned on. If you replace the batteries while the power is turned off (when the lens is retracted), the lamps on the brightness dial blink after turning on the power even with new batteries
Try the following: with the camera switched on, remove the batteries, then reinsert them. If the problem persists, the camera might indeed be defective and it is recommended to turn the camera off and remove the batteries immediately, then have it checked by a repairperson.
Note that you must use prime quality batteries in this camera. Fresh alkaline batteries from a reputable manufacturer are recommended. Be wary of cheap batteries bearing prestigious brand names, these may be counterfeits and will not perform well.
If it's less than a year old, send it in for warranty. You will need the receipt (just printed it from, amazon), and they will direct here: FUJIFILM Repair Form (fujifilmusa.com). Send that with the camera to the address on the repair form.
FUJIFILM Camera/Binocular Repair 1100 King Georges Post Rd Edison, NJ 08837
For any questions, you can contact them at 800-800-3854.
I found there is a trick to change the batteries with the camera switched on. At least with my unit. What worked for me was taking the batteries out and putting them back on WHILE pushing the ON button. Push the button all the way down and keep it pressed while you take out the batteries and put them back in. Should be good qualuty new batteries.