LEDS light-no picture or sound-fan stops

Hewlett-packard Pavilion dv7-1243cl note...
January 22, 2011 at 14:01:10
Specs: windows 7
LED's light up and the fan starts. After a few seconds the fan stops and the "Caps" LED blinks continuoesly. There is no light on the screen. There is no sound or beeps. I do not think I hear the hard drive starting up either.What woulf bre the possible causes and any advice in troubleshooting further?

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January 22, 2011 at 15:10:13
Most likely the power supply.

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January 22, 2011 at 16:20:16
This is a laptop. If you think it is the power supply are you familiar enough to know if this a serviceable/replaceable component or unit .I am a 20+ yr.elec.tech by profession servicing and repairing A/V equipment. I have changed a few laptop screens and minor fixes for friends I admittedly am pretty green with computers. A problem I should pursue or send to HP.(Actually it is father in laws).
Any advice would be helpful. Would the fan run for a few seconds if supply was bad. Is it worth even removing the HDD,memory,etc to check for defect pulling down the supply?

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