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I know this post is old, but for anyone coming from google ill answer it.
Most likely the CrapXon... I mean CapXon capacitors took a dump. Located at 822-824 on the main board. Replace those with some good authentic Rubicon, Nichicon or Panasonic 10V 1000uf caps and this thing should last till the CCFL tubes fail. If you are repairing this yourself, you might want to get a 10uf ceramic cap as well, since the white glue stuff that HP put on these things to keep them intact after a meltdown, might break your 10uf cap's insulation off at location 821.
More likely to be power supply problem due to bad caps, you need to open it up and look for caps with bulging top, post back what you see so we can guide you furhter. See example of failed HP monitors and other due to bad caps: http://s807.photobucket.com/home/budm/allalbums
Monitors go to sleep when there is no computer activity it detected. Also, when your OS is working and somehow you have set a "sleep" time, then the monitor goes to sleep at the appointed time. Just press ENTER or press the POWER BUTTON to bring it back to life without losing your computer work.
check the board postings for the HP f1903 monitor.I recall seeing a problem of the same there and a solution or fix. As it is only a newer version of the same model, it may be the same fix. Appears HP has a big problem with QA and this particular model. Lots of people have same or similar problems, and all appear to have a similar fix or solution. Tricky part... figuring out how to "Open" the monitor to check it inside!
PS - if you figure out the opening part, let us all know!