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Desktop doesn't turn on after one long beep.\

HP Recommended
Microsoft Windows 10 (64-bit)

When I tried to turn on the computer, there was one (kinda) long and loud beep, The LED light was white and normal, but nothing showed up on the monitor. I press the power button (without holding it), the PC just stopped immediately. I cannot find the problem from the "beeping" codebook. 


I tried to disconnect and connect memory cards and to do a hard reset, but no luck. Anyone can help?

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