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Computer will not boot since hdmi screen used

Question asked by afathersson on Nov 24, 2015

I have a machine with an ASUS M4A89GTD PRO motherboard and integrated Radeon HD 4290 GPU.  It has an AMD Phenom X2 555 Processor.  I had Windows 7, and upgraded to Windows 10, then changed my old monitor to one fed by an HDMI cable. Now when I turn on the computer nothing happens - no POST beep, no Windows.  But if I reboot, everything is OK, and it loads normally.  Any suggestions?