My monitor will either stay on and wont' turn off (even if you click the green button)

the power transistor on the SMPS of the monitor is blown,
you will need a skilled person to diagnose and replace the component

Tell me where on a laptop is a monitor button, first

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Regards,
joecoolvette

The problem lies in your ram. Pull the modules,swap their positions and reboot. The contacts are dirty and by removing them, they again make proper contact. Blow out dust. You will be fine.

your LCD inverter is almost dead. the monitor itself actually remains on, but just goes to black each time the LCD inverter cuts out, since this is what supplies white light to the screen.

In case you wanted The FP5315 Users Guide, or 3 other HP documents for the HP FP5315 LCD Flat Panel Monitor:
http://h10025.www1.hp.com/ewfrf/wc/manualCategory?lc=en&dlc=en&cc=us&lang=en&product=324205&

I just fixed my for less then 1 minute. Here was the problem, when turn on the PC with the monitor connected. The screen appear like normal for about 2 seconds then shut off black but the GREEN power LED stay on, if i press the power off and turn it back on the screen act the same thing.
Here how to fix it, turn off the PC, unplug the monitor power cable then plug it back. The power LED will stay amber. Hold down both brights minus - and plus + same time, turn on the PC, keep hold the - and + buttons press the power button turn on the monitor.
You will see the screen back on, just hold for about 10 more seconds till you see the screen seem to stay on fine then realse them. That's it how i fixed my.....GOOD LUCK

check the same on bios screen for a long time if the same thing happnes need a repair.

It's your video card! No Doubt! that happened to mine once and my friends and it was the same thing!

Please right click on My computer->properties- hardware-device manager-- check if your sound device is working fine. PLease let us know if we continue further

Hi I have similar, I'm an electronics engineer and took mine apart only to find the power supply is very sick to the pint the pcb that converts all the signals probably has been damaged too, ie BIN FODDER.

Not very constructive but at least I know what is wrong - if I can get any constructive info i willl post it....