Check the power supply box while plugging in the cord to the computer.
If the fan does not spin up in the power supply, you probably have a
bad power supply.
There should also be a little bulb on the motherboard, if it is not on,
then you are not getting any power to the motherboard. Which again is
pointing to a bad power supply.
You can also go to HP.COM and search there for the answer. Hopes this helps and if it doesn't then let me know,ok.
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I should a mention this is a lcd monitor from hp model 1530, the green light turn on for about 4 seconds and then turn off for a second, it must be a power supply problem, i will resolder the power suplly part. thnaks for the help
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