Connections from the power supply to hard drives and optical drives only need pushing on and pulling off. On the motherboard, however, they feel like they are latched. How do I release the latches to safely remove the power supply connections? Please help.

they are latched

theres a catch that locks onto a ridge moulded into the socket, press it and it releases and you can pull connector off, they tend to bit little stiffer to remove than other conections

Very clear. Thanks.