Question about HP Pavilion 512n PC Desktop

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On HP Pavillion 512n - When I plug the computer in only the fans work and the light on the switch is on. There is no drive sound and nothing on display. Is it a motherboard problem or power supply problem?

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First thing is to check RAM. Some times faulty RAM stops computer to load up and don not display anything.....if the problem persist try to change cmos battery>>> if problem still there then go for supply check>>>>last comes motherboard........

Posted on Sep 25, 2009

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Posted on Jan 02, 2017

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When i turn it on, its blue lights come on but nothing on the screen. I am using my sister's laptop to ask. It is an HP Pavillion.


If the computers lights are coming on and the fans are turning then the computer is receiving power. Try turning the sound on to see if you can hear the Windows Startup sounds (or Mac respectively). If you can hear the sounds then it is likely that the screen for the laptop has broken. If the laptop has a Video Card (most do not) this could also be faulty. Since you can't see anything you won't be able to fix it yourself, it will likely need to be returned to HP for laptop repairs.

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Computer will not come on loud sound from pavillion repeats it self. The fans will spin and the blue light on pavillion comes on. moniter screen will not come on the power light is on


On some computers, when you turn it on, the fan starts to run at 100% of its speed, i.e., very noisily.
Then, when it is detected that the computer is functioning, and _not_ over-heating, the fan will slow down, and quiet down.

So, what is the nature of the "loud sound" ?
Continuous? Beeps, in some pattern?

Take the computer to a qualified technician, for better trouble-shooting.

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1 Answer

Solution for ''hp computer a6020a wont turn on after two months packed away'' it worked fine then went away for two months and now will not turn on has power but no blue light and nothing happens all fans...


HP has been really great with my pavillion desktop and its out of warranty and they still help me with the issues and help me solve them it may take a while to get it taken care of you may have to emial back in forth to get your promblem taken care of. Here is the email support that you can try just provide the modle number and the serial number that should be located on one side of the computer or on the bottom of the tower, and Good Luck!
PAVILION_SUPPORT_EN@MAIL.SUPPORT.HP.COM

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sounds like it may have died try it in an external mount (on a different computer)

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hi,
if nothing(even hp logo ) is not coming on the display then please try this.
1.remove the battery and then press the power button for 30 sec.Again refix it and check.
2.If windows sound is there then this mught be the issue with display.

3.If there is no windows sound might be the issue with RAM so please get it checked.

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you have to send it back to hp to get it fixed, this is the second time mine had the same problem

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It sounds like you have a piece of junk, the hard drive mighr be OK , if it is you can put it into a USB hard drive adapter case and use it as an external USB hard drive.

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HP Pavillion 400 Power switch problem???


Could be your power supply is broken. That is a very common problem. Sometimes the computer will keep on restarting when the power supply is about to give way. I doubt it's the motherboard that is causing the problem, but then again i have never had a motherboard fail on me.

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1 Answer

Hp pavillion power problem


Perform the following steps, in order, until power is restored or it is determined that there is a hardware failure:
CAUTION: This product contains components that are easily damaged by ElectroStatic Discharge (ESD). To reduce the chance of ESD damage, work over a non-carpeted floor, use a static dissipative work surface (like a conductive foam pad), and wear an ESD wrist strap that is connected to a grounded surface, like the metal frame of a PC.
1. Disconnect all cables from the computer, including the power cord.
2. With the power cord disconnected , press the power button on the front of the computer for five seconds.
Plug in the power cord and test to see if the computer can turn on. If not, continue using these steps.
NOTE: If the power supply fan makes an inconsistent grinding sound or stops and starts erratically, replace the power supply.
3. With the power cord removed, flip the red voltage selector switch to the opposite position. Wait about five seconds, and then switch the red voltage selector switch back to its original location. Ensure that the voltage selector switch is on the correct setting, 115V for North America.
Performing this step ensures that the voltage switch is engaged and set correctly for your country/region.
4. Remove all extension cords, power strips, surge protectors and any converters that remove ground. Plug the power cable directly to the wall outlet and test to see if the computer can turn on.

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