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Power for the screen

I have got problem connect the two power Black and gray wires in the motherboard is there any one that tell where these wires connected to the motherboard with pleasure

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Black screen, hard drive not running

If you remove the power adapter, battery, RAM and hard drive. Plug in the power adapter and power it up. If you get a screen with error information on it, the motherboard is probably OK, if nothing there is a motherboard issue. If you get a screen remove the power, insert the RAM and power up again. Do the same after adding the hard drive.

Jan 03, 2014 | Toshiba Computers & Internet

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Intermittent power fail/boot-up power fail/freezing


1) Motherboard cracking.
2) Harddrive has a loose connection. Needs to PHYSICALLY be plugged in tighter.

All along a motherboard are what is called Circuit Traces. (Also known as Signal Traces)

Think of them as very thin flat copper wires.
Motherboard may be cracked, and circuit trace/s are cracked/broken. Makes an intermittent contact.

Let's look at the motherboard, and with no hardware components on it,

Motherboard installed in laptop case, the Processor, and Ram Memory are on the Top of the motherboard.
Below the main view photo shown, are three small views.

The small view to the far Left shows the Top of the motherboard. The pink rectangle is the Processor socket, (Socket S1), and below it is the graphics chipset.

Click on this small view. (Becomes main view)

Primary Ram Memory is on the Top of the motherboard, under the Keyboard.
Expansion Ram Memory is on the Bottom of the motherboard.
Memory Compartment Cover)

Now turn the motherboard photo to the Left 90 degrees.
This is how it sits in the laptop.

Note the large White label with all the writing on it, and the black rectangular chipset above it, that has Intel on it.

The long blackish/gray looking object above the Intel chipset, and connected to the outside edge of the motherboard; is where the harddrive plugs in.

The Harddrive is secured by one single screw. (Front of harddrive)
After the two screws for the Harddrive Compartment Cover are removed, and the Harddrive Compartment Cover, you can see this.

ALL power removed, (AC adapter { Charger}, and Battery), remove the harddrive compartment cover, and the single harddrive mounting screw.
Use the piece of silk flap, and see if you can plug the harddrive in tighter. Replace the mounting screw, and cover.
(Plus plug power back in)

Suspect cracking of the motherboard, at an area where the harddrive's connector on the motherboard, meets the motherboard.

Replace motherboard, (Unless you want to try using small wires as jumper wires, to connect broken circuit traces)

Could I be wrong? Yes.
Check for loose connections, then if no, completely disassemble the laptop down to the motherboard in hand, (Wearing an ESD wrist strap), and check for broken circuit traces

Under the bold black subheading -
Service and maintenance information;
Click on -

HP Compaq 6735b Notebook PC and HP Compaq 6730b Notebook PC - Maintenance and Service Guide

It is a Service Manual in PDF file form.

Do you wish to attempt repair? Post back in a Comment.


Nov 16, 2012 | HP 6730b Intel Centrino 2 Core 2 Duo P8600...

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I have a hp pavilion dv7 and the power socket has come a lose i need to know which wire goes where.....

The DC Power Jack that the AC adapter (Charger) plugs into?

Look into the DC Power Jack with a magnifying glass and light you'll see it's a center pin surrounded by a barrel. Barrel has an inside and an outside.

1) Center pin. Gold and buried down in the plastic. Connected to WHITE wire at motherboard connector.

2) Inside barrel has 4 Brass fingers.
Orient the laptop so the LED is at 12 o'clock and you'll see fingers at 12, 3, 6 and 9 o'clock.

These fingers carry the + 19 volt power to computer.
The ones at 6 and 9 o'clock do, Noon and 3 are not connected.
+19 Volt power arrives at motherboard connector on RED wire.

3. Outside barrel has six brass fingers, at 2, 3, 4, 8, 9 and 10 o'clock.
2, 3, and 4 are not used,
2, 8, 9 and 10 are the power return (common, or ground) to computer.
It arrives at motherboard on BLACK wire.

4. LED is connected to YELLOW wire and controlled by computer.
Other side of LED is jumpered to a Black wire,(Ground), outside barrel 8, 9, and 10 o'clock.

From > analog posted in an HP Support Forum.

Nov 12, 2010 | HP Pavilion dv1000 Notebook

3 Answers

The screen is black and the power light is flashing not constant and I don't think the hard drive is turning

If the screen remains black and does not show the BIOS window when powering up, coupled with the lack of hard drive power, then it sounds like you have a motherboard failure.

If your fans also do not come up, then that will confirm it.

Mar 09, 2010 | Computers & Internet

1 Answer

My HP dv9208nr laptop screen is black after I power it on.

I am sorry to tell you that this series of HP laptops has a known problem with the video chip on the motherboard. There are thousands of complaints to HP about the DV9000 seriies laptop, and yours has the same sympoms that others have reported. HP extended the warranty on some, but most people lost their shirts. There are a few people who have had mixed success in repairing the motherboards, but often they have to get replaced. If you did a google search on yor laptop problem, you will find lots of info.
The bottom line is that your laptop is expensive to fix, and it is a known problem!

Feb 03, 2010 | HP Pavilion dv9208nr Turion 64 X2 DC TL-50...

1 Answer

Hp Have black screen & 2 beep sound

Motherboard/fans/loose wiring

Oct 01, 2009 | Computers & Internet

1 Answer

Dark Grey Vertical Bar

1. try connecting laptop to an external monitor and check if this vertical dark gray bar appears. if yes it means video is the problem. you need to boot in safe mode then uninstall the video driver. boot to notmal mode then download and install the latest video driver. if still same problem then replace video card. if video is built in with motherboard you need to replace motherboard.

2. when the vertical dark gray bar did not appear in the external monitor then it means issue is with the LCD panel. Do this turn off laptop. press and hold D key then press Power button at the same time or Press and hold on the Fn key then Power button check if the test will run. Color displays full screen when you keep pressing on N key when the colors appears check the vertical dark gray bar if still exist in the test, this means LCD panel and LCD cable needs to be replaced.

Oct 31, 2008 | Computers & Internet

1 Answer

Dell Inspiron 5160 Black screen on power up

There is a small board that the power button is integrated into that connects to the motherboard. When this power board malfunctions it will cause this issue with the machine. It can, and quite often does, damage the motherboard when it malfinctions. You should take the machine in for a power board replacement and a diagnostic to make sure that the power board hasn't damaged the motherboard.

Jul 14, 2008 | Dell Inspiron 5160 Notebook

1 Answer

TFT Screen Loose Connection?


These models sometimes have a problem with flickering screens, screens going black, etc. This is caused by the cable running from your LCD lid area to your motherboard.

To gain access to this cable, flip your laptop upside-down, but make sure the back is facing you (vents and such). There are 4 screws along this side, you only need to take out the middle two.

Once that is done, flip your laptop upright again, open the lid and pry up the power bar. The cable you seek is running on the right side, should be wrapped in gray-colored tape.

Adjust this cable so that it cannot move and is not being pinched, and you should be set.

If that didn't work, and since your LCD is no longer lighting up at all, I'm almost leaning towards your problem being your inverter board. Very easy to swap out, and cheap at around $20 at

The LCD inverter board is located at the bottom front part of the LCD lid. Just take off the front frame of your lid by removing the power bar (as instructed above) and then removing the screws under the rubber bumpers on the LCD frame. Then it's just a matter of carefully peeling the glue holding the frame down at the bottom.

Your inverter board is the long green-colored board you should see with the front frame removed. This board will have two connections plugged into it. Quite the easy swap, yes?

Good luck!

Nov 06, 2007 | E-Machines M2350 Notebook

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