Due to energy conservation requirements by the government, The power supply has to go into a sleep mode or minimum power after a long period of time, it may be that it does not wake up from sleep mode. In this case the only thing to do is to pull the plug and plug it back in. I would try the hp web site and register a problem. They should rectify the problem.
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If the red light won't come on it is not getting power.First,try plugging it in to a different outlet,or unplug one of the gadgets you know is working and plug the tv in there.You are simply switching.If you know that there is power coming from the outlet and it still won't come on then you'll have to check the cord;don't go much farther than that without expert help.
Try to reset the power of the machine first by unplugging the power cord of the printer from the wall. Let the printer sits for 5 mins then plug it back in then turn it on. Wait until the printer finished initializinf then try to turn off the printer and see if it will respond.
Try to power drain it. Unplug all the power related devices that are connected, like a monitor data cable or external printer, just unplug all the cables in the back after you shut down your computer, press the power switch of your computer and keep it pressed for about 45 secs, release it, plug everything back and check it if its working. As well double check if that particular socket is usable, plug something else in to see if its working.
Hold down the power button for 10 seconds. That will hard-shut the PC. Once that is done, fire it back up, and try again. Somethimes, windows will act goofy shutting down. Especially Vista when it is left on too long without shutting it down.