The Qoltec product with the code 51775 is not compatible with a Samsung Ativ One 5 DP505A computer. Here are the reasons why:

- The Qoltec product 51775 is designed specifically for LG monitors, with a power of 40W and a voltage of 19V.
- The Samsung Ativ One 5 DP505A computer requires a 60W or 90W power adapter, depending on the model, and not 40W.

It is important to choose a power adapter that matches the exact specifications of your device to ensure a stable and safe power supply.