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While i was working on my other computer it turned off, i had been on for awhile so i figured it might have over heated so i left it alone for a couple hours. When i tried to start it it sounded like it was about to start up fine but then everything stoped and just the green light was left on. So i turned it off and tried powering up again, and now nothing happens except for the green light going on.
I hear nothing try and start not even fans.

This computer has been running for the past year without problems.

My only thought is recently i bought a new mouse and that probably uses more power then my previous one (both optical however) and that it burnt out the psu?

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  • Latest Post Latest Post by caperjack

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Brief note tied to the thread: ’s description (system shows standby power but won’t really start) and ’s PSU idea point to a power-delivery or shorting problem, not a new mouse. A typical optical mouse draws only a few dozen milliamps on the USB 5V rail, so it’s extremely unlikely to “burn out” a PSU by itself. Try the checklist below to isolate the fault before replacing parts.

  • Cut power, discharge yourself, then check basics: try a different mains lead and wall socket, make sure the PSU back switch is on, and confirm the front-panel power switch/header is seated correctly.
  • Remove all nonessential devices (external USB, drives, add-in cards). Boot with a minimal bench configuration: motherboard + CPU + one stick RAM + PSU (use onboard video if available). That isolates shorts and bad peripherals.
  • If the system still won’t spin fans, try the power-switch bypass (momentarily short the two PWR_SW pins) to rule out a faulty case switch. Use extreme care to avoid touching other components.
  • Test the PSU: either swap a known-good PSU or use a PSU tester/multimeter. The common “paperclip” test can show whether the supply starts, but it’s not definitive—modern PSUs may need a load to stabilize. Don’t open the PSU; it’s dangerous.
  • Look for visual signs on the board: bulging or leaking capacitors, scorch marks, or a burnt smell. Also try the board outside the case on non-conductive surface to rule out a mounting short.

If a known-good PSU makes the system work, replace the old PSU. If a good PSU still fails with the minimal setup, the motherboard (or rarely the CPU) is likely at fault. If uncertain or uncomfortable working inside the case, swapping the PSU at a local shop or borrowing one from a friend is the quickest reliable test.

Member Avatar for caperjack

While i was working on my other computer it turned off, i had been on for awhile so i figured it might have over heated so i left it alone for a couple hours. When i tried to start it it sounded like it was about to start up fine but then everything stoped and just the green light was left on. So i turned it off and tried powering up again, and now nothing happens except for the green light going on.
I hear nothing try and start not even fans.

This computer has been running for the past year without problems.

My only thought is recently i bought a new mouse and that probably uses more power then my previous one (both optical however) and that it burnt out the psu?

You might be thinking right about it being a power supply ,can't imaging it being the mouses fault though ,all you need to do is try a new PSU

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