HP Pavilion dv2807nr. Turn power on and it does nothing. all blue lights, but no screen or keyboard response?

While your system is still booting from start, keep hitting F11 to get past that point then proceed with the system recovery.

check your hardwares.either memory has mulfunctioned

hi texin.
check this link out you might find something there that might help you out.
HP Pavilion s7320 faults Google Search

Sorry but the chipset on the motherboard failed, you will have to replace the board.

if the fan is not on, the cpu may be fried and not working

It is probably that the inverter or the backlights have packed up

Turn the machine so that a strong light shines on the screen from the side you may then see the windows splash screen in the background.

Other check is to plug another monitor into the port on the laptop if that works then it is down to the inverter

The fact is *********** board is very likely the matter. See all devices that do not need the motherboard to respond are all working (cd/dvd tray opens and closes, fans are on etc). On the other hand all devices that need the motherboard to respond are not working (keyboard, optical mouse, etc). It is more or less conclusive.

That a nice computer you have there. Based on your description, my guess is you have a bad power supply.
About a $300 fix if you send back to HP. Which is what I had to do a while back.

Sounds like a power surge fried the electrical connections inside.

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