Recommended guidance200 Series What to checkUsually a Monitor on power up will turn from Black to Dark grey or blue with no video input, Check you have 20v DC input.Corrective Action Replace phone PCB. Additional notes Change to the newer version with larger screen, 232VLinks https://www.entryphone.co.uk/shop/productdetail/PCC-202Vhttps://www.entryphone.co.uk/shop/productdetail/PCC-204V Start againCall technical support: 020 8870 8635 →Send a support enquiry →