I bought a brand new Compaq Presario CQ43 and turned it on, the computer started. i heard the drivers start up etc but the screen stayed black. i went onto a few forums and they said take the battery out, unplug from power. hold power button for 60 seconds. plug back into power and turn on then restart and put battery back in. this did not work i tried it 4 times and the screen stayed black each time. i don't know what to do

SOURCE: Black Screen / Computer Stays in Standby Mode

Completely remove the battery and unplug the power cord for a few minutes. Reinsert battery and power up. You can also hit F8 when starting and see if you can boot into safe mode.

SOURCE: my compaq presario v5000 shut down and wont restart

My Presario v5000 is doing the same as above. Except, I let it cool for a little while and it turned on. Now it only turns off after a while. I'm not to sure exactly why that is but i could possibly be an over heating automatic shutdown procedure.

SOURCE: no screen on starting laptop

remove the battery from bottom, plug into ac power pack, and try it that way

SOURCE: compaq presario v5000 won't start or post

It's the motherboard. Check to see if yours is still under warranty even if you've had it for over a year.

HP / Compaq has recently extended their warranty period for certain models.

Warranty Check

Let me know if you have any other questions.

SOURCE: Compaq Presario F700 wont boot. Powers up then turns off again a

that means you might have a hardware failure. possible powersupply. check with local shop.