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Monitor Turns On for a Few Seconds and Then Goes Off

Practice




The monitor turns on for a few seconds and then goes dark
What is the cause of this problem?

if the message No Signal appears, the frequency is exceeded -
then possibly the resolution or screen refresh rate is exceeded - reboot into safe mode (press F8 or F5 before the system loads)

if the monitor just turns on for a second and the backlight is not LED but tube-based (CCFL), and sometimes under strong ambient light an image is visible -
then the matrix backlight inverter is probably damaged


if it does not turn on at all - then the PSU in the monitor has probably burned out, less often the video controller


in this case there is also a chance that the video connectors or video cable, or even the video card, are damaged,
try with a different monitor, with a different computer, or with a different video card (note that a single PC may have 2 video cards, the integrated video card can be enabled via the BIOS)
created: 2012-02-11
updated: 2026-03-10
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Lectures and tutorial on "Diagnostics, maintenance and repair of electronic and radio equipment"

Terms: Diagnostics, maintenance and repair of electronic and radio equipment