If you have no display on the handset of your A300:
1. Check the battery installation. Make sure the flat side of the battery is against the spring. If the phone is over a year old, the batteries may need to be replaced with new rechargeable batteries. Please be sure to only put rechargeable batteries in the phone.
2. Make sure the phone was not accidentally powered ‘OFF’ by pressing and holding the End button. Simply placing the handset back in the base will immediately power the handset back ON if it was powered OFF.
3. If the screen lights up but there is no display and the Torch light is on, the phone is not working right and should be sent in for service. If the Torch light is off, try adjusting the contrast setting.