My desktop computer shows random colors (red, blue, green, etc.) then shuts down, and this happens randomly either once I turn it on or after hours of operation, I have 2 RAM on my computer, I turned on the computer with each RAM separately and switched their places And cleaned them again, I changed the hard disk, and I changed the monitor and the same problem still occurs. It happens during safe mode and BIOS mode, so I don't think the problem is related to the software....... HELP :(