Mac power light flashes 3 times, no usb response mac was in sleep mode, I accidently hit power button, now all I get is three flashes pause then 3 flashes again, and fans go into hyper drive monitor blank screen, no keyboard or mouse response, mouse doesn't light up--no chimes on restart- can't zap the pram (no keyboard response)

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Push the power button and wait for 10 seconds.
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