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Computer power up, no screen, LED1 is on and steady

HP Recommended
HP Pro 3420 AIO
Microsoft Windows 7 (64-bit)

when I plug in the computer, it powers on automatically. There is no screen or sound or flashes to indicate error. I replaced the BIOS battery and the memory, the computer then doesn’t power on. I noticed that LED1 next to the ram is red and steady. Still there is no screen , sounds, or error messages. Is there any way to understand what’s going on with this computer? 


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