First released in 2010, the HP Compaq Presario CQ56-110US is one of the models offered in the Compaq Presario Notebook series.

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comes on and goes off immediately

My Compaq cq56 comes on and goes off immediately keep for along time

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@osaretin1234does it power down or is it just your screen that turns black?

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I have the same with my Compaq615. At start up it gives one beep and powers down. It is plugged in and nothing comes on the screen and the power light goes off.

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Hi @maarmuis,

Usually 1 beep indicates a successful POST on HP/Compaq laptops.

Do you get the “splash” screen displaying on startup, before the “beep”?

Try a power refresh and check if this resolves the problem.

Remove the charger (if connected) and the battery from the laptop.

Press and hold the Power button for 30 seconds to drain any residual power from the laptop, then release the button.

Reconnect and switch on the charger to the laptop (leave the battery out at this stage).

Try to turn on the laptop.

If it starts OK, allow it to boot all the way to the Windows desktop (if you have Windows installed), wait for the HDD activity to settle a bit, then shutdown the laptop in the normal manner.

When it has completely shutdown, switch off and disconnect the charger from the laptop.

Reinsert the battery into the laptop.

Reconnect and switch on the charger to the laptop.

Try to turn on the laptop.

If it starts OK, allow it to boot all the way to the Windows desktop (if you have Windows installed), wait for the HDD activity to settle a bit, then check the charge status of the battery. if it is charging allow it to fully charge before switching off the charger and disconnecting it from the laptop.

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There is a variety of things that could be going wrong with the computer, but there is a series of tests you could do to isolate the issue. Here's a question for you. Does the computer have a good battery? Does it continually shut off right after being turned on when plugged into a power source? Does the computer get past the HP logo and get to the Windows boot screen? And after the computer screen goes black, does the power light stay illuminated? These questions are all questions that will help isolate the problem.

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