A fixing system for fixing a liquid cooling block on a heat-generating electronic component, the fixing system comprising a mounting bracket and an indicator. The mounting bracket comprises a main portion overlying at least part of the liquid cooling block in order to urge the liquid cooling block against the heat-generating electronic component, and an outer connecting portion extending from the main portion and configured to be fastened to a substrate on which the heat-generating electronic component is disposed. The indicator is disposed between the main portion and the liquid cooling block, and undergoes deformation in response to the outer connecting portion being progressively fastened to the substrate in order to provide an indication to a user that a desired amount of pressure is exerted between the mounting bracket and the liquid cooling block for establishing adequate contact between the liquid cooling block and the heat-generating electronic component.