Your PC's C14 socket is fine. The device on the other end has a C13. You just need a short bridge. This 2m 8WARE IEC C14-to-C13 lead does exactly that – monitor to PC, PC to UPS, UPS to device. No adapter needed, no 'which end goes where' confusion. Plug in, done
| brand | 8WARE |
| cable_length | 2m |
| connector_a | IEC C14 male |
| connector_b | IEC C13 female |
| voltage | 240V |
| application | PC / monitor / UPS to C13 device |