Power button flashes once and wont turn on.

When I press the power button on the computer the power button light flashes once and won't turn on when I plug the a.c. adapter in it shows that it's charging and plugged in, but anytime I press the power button it flashes once but will never turn on! :/ I tried unplugging the adapter hold the power button for 30 seconds and connecting the adapter back to the computer but it does the same thing.. Any advice would be AMAZING! Thanks !
The computer is compaq Presario cq62-215dx

Remove everyhting from your pc. INCLUDING KEYBOARD. and try again. On 2 different occassions the keyboard was to blame. Some spill on keyboard caused motherboard not to power up.
Remove KB, Ram, Hdd, DISPLAY (Lcd cable might be shorting as well) etc.etc. Leave motherboard alone but   power sithc connected. Even if you disconnect the fan cable it would help. If you see anything on your screen after you removed fan too then turn it off immediately and connect the fan back and try again then add up other components one by one. If none works then i am sorry the board you have is faulty. 
or it may need a bios recovery.

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