Hp pavilion monitor not starting up

You should try it with another PC amd also check the video cable frist, it is the monitor problem, then please see my album for the common problem with this model.
This model was known for bad solder joints, which can cause damage to the transistors also.
http://s807.photobucket.com/albums/yy352/budm/HP/HP%20F1703/

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm/

Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.

First of all you can check the computer by connecting another monitor to it to see if the problem goes away...if so then the problem would be in the monitor. If not , then I would try to change the video grafics card in the computer(assuming you don't have built in video). If you have built in video on the mother board then you will either need to replace the motherboard or disable the onboard video and install a video card

If this monitor (HP w1907) is going into sleep mode the normally blue power led will change to yellow. This indicates loss of video signal or possible out of range resolution. If the picture goes dark and the power lite stays blue, you have a backlight malfunction. It can be an inverter power fault but this model mostly has worn out backlights causing a shutdown condition.
Monitor Mike

Thsi model has known problem with bad solder joints due to contamination, you need to remove the old solder on the four inductor leads, clean the leads eal well and resolder, see my pictures here: http://s807.photobucket.com/albums/yy352/budm/HP%20F1703/
Al so look to see any one of the capacitors have bulging top, they should be completely flat top.

Check physical connections first, check monitor cable if securely plugged in and then check power light of monitor. If power light on monitor is amber or yellow it means that monitor is not getting a signal from cpu/ tower. Try to do a power drain on the computer, remove power cable at the back of the computer and then press and hold the power button for 10 secs, after that plug in power cable again and restart the computer.Check if there is any connection if not then try to use another monitor, a known good one. If you get a video from another monitor it means monitor is already defective.

when i power start my computer,,the light come on and seems to operate but the monitor doesn't come on,,,when switichin the monitor off and on , the blue light comes on and it reads monitor goin to sleep and the screen gets dark,,but the monitor orange light is on,,,pls help

Hi

You have parts on the power supply board which are going bad. You can send it to a company like mine or take it to a local repair person.

Sounds like the CRT is starting to go bad cause its taking longer and longer for it to boot up. CRT's aren't available now so a new monitor would be the only option.

The "tin can" symbol below the yellow light signifies a hard disk. The yellow light is a hard disk activity indicator, it is nothing to worry about. It is just tell you that the computer is accessing the hard drive.

Problem is generally dry solder joints around the inverter transformer on the inverter PCB.