Hi, everyone! For two buildings in the past twenty days happened to us that the PC-based system with card NV8416T and NV series software (V7.9.0.0029) to switch from PAL to NTSC and the picture on analog cameras can not be viewed. After the switch back to PAL system everything is working normally. PC is powered by the UPS. System configuration is: Motherboard: ASUS P875-M LE CPU: Intel Core i3 Graphics: VTX3D HD7750 1GB MEM: 4 GB DDR3 HDD: 3 x 2TB Power: 430 W OS: Win 7 Pro 64-bit Card: AverMedia NV8416T On one system is connected to 16 analog cameras, while the other system is connected to 11 analog and 5 IP cameras.