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The symptoms certainly do sound like you have a failed power supply unit (PSU). The motherboard is HP proprietary. It has a 4-pin power connector. You will have to buy a new PSU directly from HP. Unfortunately, HP doesn't show the PSU's available in Canada. Here is a Power Supply Cross-Reference Chart to see where I got this information: https://h30434.www3.hp.com/t5/Desktop-Knowledge-Base/Power-Supply-Cross-Reference-for-specific-model...
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