Problem presario cq50 not powering up

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Hi all,

I Have a friends presario cq50 notebook which won't power up at all.

When i power it on with just the battery in, i get nothing. No lights show, no sounds, it's dead.

When i connect the notebook to the mains the a/c light shows on the front of the notebook. I then try to power it up and the a/c light on the front goes off and then nothing happens at all, no lights show, no sounds, nothing.

On the front of the notebook there are 3 lights that can show and those are:
the power on light, the a/c light and the hard drive access light. The power and h/d light never ever light up.

I'm kinda stumped as to what it could be so any suggestions, help or advice would be welcome.

Cheers guys

 

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The motherboard battery may be dead, replace it.

 

Hi GBL,

Is this the cmos battery you are refering to?
If so, i've tested it and it appears to be at the correct voltage.

 

Those symptoms are typical of a failed PSU.

I'm not sure what the DC output of the power supply is for that particular model but usually it's around 18 Volts.

Grab a multimeter and check whether the PSU is supplying what it should.

The laptop connection plugs come in various shapes and sizes, so if you are going to replace the PSU with a generic one, make sure that it has a plug of the same dimension as the existing power supply.

 

Yeah i replaced the power supply unit too with the specified type but still no difference.
I also tested the power supply and it is giving out the correct voltage.

I'm really stumped here....

 

How old is this laptop and is it under warranty?

Ok, well there is a tiny chance it could be the battery, as i have heard that some laptops wont boot without a battery connected, but i have yet to see this for myself. It could well be just a myth

Obviously it's a hardware problem and with laptops most things are on one board, often named the *system* board. So, that is the most likely candidate and if so, it's going to cost an arm and a leg.

 

Let me know if you find a solution. My CQ50 did the same thing today.

 

As a next step a friend of a friend is going to let me borrow his battery from his cq50 and i'll try that.
Won't get it until a couple of days time but i'll post back and let you know if anything happens.

 

Well no joy after trying another working battery so i'm stumped on this one.
Perhaps the mainboard is just knackered.
Anyone got any other suggestions?