HP Pavilion dv4 notepad not booting. NEED Help!!!

Hi There,
I have HP Pavilion DV4. For some odd reason, when I turn on my notepad, I just get one flash of power light, volume indicating light, num lock light, caps lock light, and screen stays blank. Notepad doesn't boot but power light keeps flashing.
Initially I thought maybe my battery was low, so I plugged in the AC adaptor overnight and in morning it behaved the same way. I have tried all solutions suggested in blogs all over (including removing AC adaptor and battery and hold down power button for a minute, etc.) I am still not able to get my notepad to turn on. I have even tried to have it plugged in for few days, but I get the same thing from it.
I would greatly appreciate it if someone could help me out with this issue.
Thanks.

Have you tried to start it with just the power adaptor connected and the battery removed? Have you disconnected all external devices that may be attached to the notebook?
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