HP P6730f window 7, no video/wireless usb mouse wont respond/no caps num lock lite on keyboard

Good Morning, I have a HP P6730f running window 7 home that has developed a problem. It had shut it down & rebooted but when I pushed the power on button on the box which turned on & started the reboot. However the monitor remained black (it was turned on), the usb wireless mouse didnt work, & the keyboard didnt respond (num & cap lock lights wouldnt turn on or off). I turned it off & removed the cables & replaced them & tried to start up again & same thing happened.
The system is abt 3 1/2 yrs old.
Any suggestions?

Hardtarget2, welcome to the forum.
The symptoms that you describe could be a failing power supply unit (PSU). Here is a guide to help you troubleshoot it. If the computer doesn't boot completely or there is not enough power for the computer to operate properly, the USB devices won't power-on.
Please click the "Thumbs up + button" if I have helped you and click "Accept as Solution" if your problem is solved.
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