Beeping CPU PSU issue or what

One of my computers stopped working. It would just make the loud beeping noise after beeping. The power to the keyboard and mouse stopped working. The monitor would state no input. I checked the battery first, all good. Then I checked the hard drive in another similar computer. All was good. So I checked cd drive. All good. So the next was the power supply. I removed the PS from another computer. Same model PS. After placing the power supply out of the good computer into the not functioning computer nothing happened. Power Supply Unit are the same model HP- D2537f3R. All three fans are working. The beeps are 5 seconds apart and last about 2 seconds. The beeping does not stop unless you power down. I disconnected the connections to the cd and hard drive. Rebooted still beeping. Removed memory and rebooted, still beeping. Then disconnect the P7 that goes to the Motherboard. BEEPING STOPPED. SO WHAT IS WRONG?
I need to get this one up and working because it is my homeschooled son's computer. Thanks :sweat:
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More about beeping issue what
  1. Work through our standard checklist and troubleshooting thread:
    I mean work through, not just read over it.

    Breadboard - that will isolate any kind of case problem.

    The breadboarding thread has a paragraph about how to build and test a PC in stages.

    Breadboard with just motherboard, CPU & HSF, case speaker, and PSU.

    You can turn on the PC by momentarily shorting the two pins that the case power switch goes to.

    You should hear a series of long, single beeps indicating memory problems.
    Silence indicates a problem with (in most likely order) the PSU, motherboard, or CPU.

    If no beeps:
    At this point, you can sort of check the PSU. Try to borrow a known good PSU. If you cannot do that, use a DMM to measure the voltages. Measure between the colored wires and either chassis ground or the black wires. Yellow wires should be 12 volts. Red wires: +5 volts, orange wires: +3.3 volts, blue wire : -12 volts, violet wire: 5 volts always on. Tolerances are +/- 5% except for the -12 volts which is +/- 10%.

    The gray wire is really important. It should go from 0 to +5 volts when you turn the PSU on with the case switch. CPU needs this signal to boot.

    You can turn on the PSU by completely disconnecting the PSU and using a paperclip or jumper wire to short the green wire to one of the neighboring black wires.

    This checks the PSU under no load conditions, so it is not completely reliable. But if
    it can not pass this, it is dead. Then repeat the checks with the PSU plugged into the computer to put a load on the PSU.

    If the system beeps:
    If it looks like the PSU is good, install a memory stick. Boot. Beep pattern should change to one long and several short beeps indicating a missing graphics card. Silence or long single beeps indicate a problem with the memory.

    Insert the video card and connect any necessary PCIe power connectors. Boot. At this point, the system should POST successfully (a single short beep). Note: you do not need keyboard, mouse, monitor, or drives to successfully POST.

    Now start connecting the rest of the devices starting with the monitor, then keyboard and mouse, then the rest of the devices, testing after each step.
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