HP 2509m keeps going to sleep - HP 2509m 25 in. TV

This is because the monitor's Power Button Lockout function is enabled. Press and hold the Power button for 10 seconds to unlock the Power button function. Your sleep problem should also be related to the lockout issue.

that's hardware , you need to open cover and check it

Hello Laura_edw513,

The following link will open a document that contains instructions with pictures on how to disassemble the HP 2509 LCD monitor. The document is in PDF format so you should be able to save the file to your computer if you choose. This should help you with the problem you are having. I hope this is what you are looking for but if you need further assistance, please feel free to ask.

http://www.hp.com/hpinfo/globalcitizenship/environment/productdata/Countries/_MultiCountry/disassembly_monito_201041519166.pdf

I had the same issue, It actually turned out to be the backlights themselves. An easy way to check this is by shining a bright light on the screen while its on. you should be able to see the picture.

Try checking your power supply, Ram and video card, I have experienced this kind of problem with one of my client and the result is that my client has a faulty ram/memory. I replaced it with a new one and it worked like new again. But in your case I'm not sure what is the exact problem, the thing you can do is checked those three parts that I've mentioned. hope this helps.

go to power saving options in control panel and set monitor to always on !

I FIX LOTS OF COMPUTER, AND MY ADVISE IS. IT MIGHT BE YOUR COMPUTERS VIDEO CARD CAUSING THAT PROBLEM . ALSO CHECK FOR VIRUSES THEY CAN DO STRANGE THINGS.

It is probably going to sleep because it's not getting any keyboard input.
You'll need to go to the control panel and the power options and tell it not to go to sleep or at least increase the time that it will remain idle before going to sleep.

Watching movies is not input, so it thinks you are not using it.

ur comp has an estimated time set by the company which is 20 mins if ther is no activity on the comp it goes to sleep wht u ave to do is go in device manager and uncheck the box in display frm advance option in tht way ur comp will never go to sleep dont know if u will understand this not good at typing working for tech supp for hp used to talking no typing

I have to keep my pc in safemode now as mine is also in constant sleep mode and I can not get it out, It is the only way it will load up! :-(