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Need to know how to know if motherboard OR display is bad

HP 1155 All In One

My HP 1155 will not boot: 

Power light is ON. 

HD Light is NOT On Tried the troubleshooting steps online and still not work. 

It is either the motherboard or the display.  Maybe the backlight board. 

All cables are tight

Cannot get on to see OS-probably Windows 8/10

Customer said it just stopped after turning off power the night before

 

Can anyone tell me how to determine which one is bad so I can purchase it and replace it?

 

 

 

 

 

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Need to know how to know if motherboard OR display is bad

Hi,

 

The full HP product number only would help.

 

Are you a PC technician?

 

Regards

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Need to know how to know if motherboard OR display is bad

PN# = E3S52UT#ABA  .  I am a computer repairman but a certified HP technician (if that exists)

 

 

 

 

 

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