try disconnecting and reconnecting all the power supply cables that connect to motherboard. I had one in the shop recently that had the same issue and a new power supply resolved it. can you try a different power supply?
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If your computer refuses to boot or tends to turn off without warning, see the [https://www.ifixit.com/Wiki/Faulty_Power_Supply_to_Motherboard?revisionid=HEAD|Faulty Power Supply to Motherboard problem page] for possible causes and solutions.
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Try disconnecting and reconnecting all the power supply cables that connect to the motherboard. I had one in the shop recently that had the same issue and a new power supply resolved it. Can you try a different power supply?
try disconnecting and reconnecting all the power supply cables that connect to motherboard. I had one in the shop recently that had the same issue and a new power supply resolved it. can you try a different power supply?
It's worth checking before scrapping the MB.