no display but computer is on

pc is p4, very old. no display and keyboard not working, mouse light on. processor fan on that means computer is on. what to do

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try re-seating the processor, check your memory cards(RAM). sometimes it can also be your graphics card also.

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Try one stick of memory (RAM) if you have two. One or more can be faulty.

There are a lot of points of failure. Does the computer make a beep sound? I think most pentium 4 computers have a PC bios post speaker in them.

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