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How many times does the red light come on ? It should blink a number of times, then go off for a little while, and start blinking again. The number of blinks within each cycle will help you find out what is wrong:
Number of 1-second red LED blinks followed by 2-second pause, then repeats:
2-processor thermal protection activated
3-processor not installed
4-power supply failure
7-PCA failure (ROM detected failure prior to video)
8-invalid ROM, bootblock recover mode
The DPMS standard (Display Power Management Signaling) was developed to extend the useful life of PC monitors as well as to conserve the relatively high amount of energy used by monitors when not required.
In brief terms it works as follows.
The DPMS compliant video controller and the DPMS compliant monitor use the Horizontal sync and Vertical sync signals to control the power mode of the monitor. Because there are 2 signal lines, it allows 4 modes of operation. Normal, Standby, Suspend and Off.
Go to your power management source located in the control panel and make the needed adjustments.
DPMS (Display Power Management
Signaling) is a standard developed to save energy and maximize the
useful life of computer displays. By switching the horizontal and
vertical sync lines on or off, a DPMS compliant video card provides the
capability to place the monitor into one of four modes (Normal, Standby,
Suspend, Off). Each mode puts the display into a different powered
state from fully powered up, to the Off mode. In the Off mode, only a
small auxilliary circuit is running which monitors the horizontal and
vertical signals to wake up the monitor.
Most times this means it is communication between monitor and pc it self. You can try to disable monitor turn off and hard drive turn off from power management scheme in control panel and see does it fix it. If it does it can be software or hardware issue and you need to take it in to have it looked at. If you cant boot in normal mode go to safe mode by tapping F8 key on restart and choosing safe mode and going about turning off same stuff as in normal screen and once done just reboot to go to normal mode. Hope this helps.