hp pavillion 15-po78sa black screen and caps lock flashing


May 23, 2016
i have a hp pavillion 15-po78sa when i first turn the laptop on the light on the power button flashes on for 1 second then the power cuts out and you hear a click as if its gone off, then it reboots itself, the caps lock button flashes 3 times, pauses for a second or so, flashes 3 more times pauses again and repeats this sequence 3 or 4 times before powering off and restarting the whole process again, the screen stays black the whole time.

Anyone with any suggestions as to what the problem could be and any ideas on how to get it fixed would be a great help.

Thanks, Mark

Please do try these troubleshooting steps that I suggested to others that may help.

- Start by doing a hard reboot, remove the battery and unplug the AC adapter then press and hold the power button for 20 seconds then try booting it up again.
- If this will not work, do test the AC adapter if it's working properly. Remove the battery and power the laptop with just the AC adapter connected and see if it will boot up or not. do also try a different AC adapter that has the same voltage and see if it will work or not.
- Proceed with reseating the RAM's if trying a different AC adapter will not work, remove them all for couple of seconds then put them back in making sure everything is seated properly.
- If it will still not work, connect an external monitor and see if you'll get any display from it. If there's a display on the external monitor that could mean that the problem is the built in display.
- But if there's still no display on the external monitor that means the problem lies in the motherboard.

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