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davy999Flag for Denmark

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Blank screen

Hi all

I have hp desktop theres power to the fans and graphics card and harddisk but not post and
the screen is black. ive changed the graphics card but still now joy.

Thanks
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sysreq2000

Probably a burned out backlight thingy. Is it under warranty still? Test with an external monitor and see if that works, if os, you will probably need to replace the screen.
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greedj
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do you see a splash screen at all?  Have you checked to cable to the monitor to make sure its good, also have you checked the monitor on a different computer to see if it works. Pull the memory on the computer to see if it beeps to give us a sign the computer is working
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Raymond Peng
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1) it not a monitor problem thats been checked and works well

2) Just left one stick of ram.
 

 3) I have also disconnect all external and internal (hard drives / Printers / CD ROM) devices to see if it posts


4) Changed the cmos battery

still no posts
no error beeps? does it have onboard graphics?

Specs / Brand of motherboard and cpu?
i would say a motherboard if it doesn't beep when you remove all memory
If it's an external graphics card, pull it out, blow out the dust, plug it back in.
If it's an internal card, then like everyone has already said, your motherboard probably bust.
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ASKER

it has an external card and an internal card have removed external and tried just with
internal no beeps
sounds like your motherboard lacks onboard speakers (should buy one cheaply and hook it up so help diagnose) http://www.amazon.com/PC-Internal-Mini-Onboard-Speaker/dp/B002W4M0DW
and sounds like a motherboard issue if it's not posting but lack of error beeps makes it hard to tell.
Swap out your power supply, if you have not done so.  A malfunctioning power supply can provide enough current to run fans, but not boot the system.  You also need to make sure the 4-wire square plug is connected to the motherboard.
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