Yellow capacitor.
If the mainframe is working properly, the display is broken. If the host is not running properly, it is the host failure, it is likely to be the cause of the memory, unplug and wipe clean and plug in, you can. And how long your monitoring has been used, if it has been open for several years, there is another possibility, the motherboard capacitor burst, it is good to open, and it will not work after the power off.