I open my computer but the screen is blank. What can I do?

Is it on, plugged in, got the right equipment, wait how did you put this on if u have no cpu?

is it on?

Make sure the monitor is on.

If the computer is on but the screen is blank, there may be an issue with the connection between the computer and the screen. First, check to see if the monitor is plugged into a power point and that the connection between the monitor and computer hard drive is secure. If the problem is on a laptop, then you may need to get a professional to fix it as some of the internal wires may be worn. :)
Hope it can help you :)