HP desktop dead after adding new hard disk

December 7, 2011 at 05:31:36
Specs: Windows XP
I added a new hard disk and when I turned back on PC there was nothing. Green light on Hi-Pro power supply was blinking, no fans, dead silence. Bought another PSU but same thing, no fans turning, no hum, nothing. Put back original, removed all additional hard disk but same thing. Is my motherboard fried?

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December 7, 2011 at 06:10:04
Did you have the computer unplugged when working on it? Another issue is ESD (Electro Static Discharge). ESD can damage sensitive electronic components is proper precautions are not taken.

You may have connected something wrong and that is why the computer would not boot after adding the additional hard drive. Was the additional hard drive new or used?

When you were inside the case you may have jarred something loose. I suggest you unplug the computer then before toughing anything in the case you ground yourself to discharge any static charge on your body. Then re-seat all the wiring connections, the memory cards and any add in cards.

The small power draw of the additional hard drive shouldn't overload a power supply that was previously working OK.

You didn't supply any specs for you computer but virtually all modern systems require a 12V 4 or 8 pin two row connector that plugs into the motherboard near the CPU. This is in addition to the main power connector (20 or 24 pin). It is often overlooked. If you have an add in graphics card, it may require a dedicated power connector as well.

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December 7, 2011 at 08:34:17
thanks for quick response...

yes, computer was unplugged but I was not too careful about static.
additional hard drive was new; Seagate 3TB.

I am pretty certain that I connected all power to motherboard. It has a 24 pin plug, and new PSU has a 20+4 connector (I matched the wire colors), also an additional 4 pin plug on a separate part of board.

I will try grounding and reseating but strange no fan movement even with new PSU and orig disks. Any lights on the mother board? I guess I need to find the model and schematic.

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December 7, 2011 at 09:18:18
Still no specs provided.

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Related Solutions

December 7, 2011 at 11:16:55
As above, we need detailed specs.

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December 7, 2011 at 15:09:04
Go here:
Scroll down a bit.
Look for the similar label on the outside of your computer.
Quote the specific model number - that's at the end of the first line.
Quote the Product number - that's on the third line.

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December 8, 2011 at 03:44:18
PC is: HP m9425f
motherboard: Asus IPIBL-LB (Benicia)
Northbridge chipset: Intel G33 Express
Southbridge chipset: Intel ICH9R
Intel Core 2 Quad Q8200
memory: 6GB PC2-6400 MB/sec Four 240-pin DDR2 DIMM sockets filled
Video: NVIDIA GeForce 9500 GS
TV: Hauppauge NTSC and ATSC
Power: 350W HiPro
OS: Windows Vista Home Premium with Windows Media Center (64-bit)

hp doc

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December 8, 2011 at 04:06:48
Oh, and on the motherboard I connected 2 power plugs below; the other connections were not touched. Have not had a chance to reseat everything but I am skeptical it will do anything.

The main 24 pin white connector in the middle right. on the new power supply it came in 2 plugs: a 20 pin + a 4 pin.

And I connected a 4 pin power connector to the top left of the diagram at here

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December 8, 2011 at 10:43:05
As OtheHill has stated, the computer should work fine with the new hard drive since it draws very little power , unless you un-intentionally jarred something loose or unplugged something and forgot to plug it back in.
That's assuming you DID unplug the computer before fiddling around with any connections inside the case BEFORE you installed the hard drive, and at ALL times when you were fiddling around inside the case after that.

HP Pavilion Elite m9425f Desktop PC (home support page, USA)

m9425f Specs (your "here" link)

HP and Compaq Desktop PCs - Motherboard Specifications, IPIBL-LB (Benicia)


Integrated graphics using Intel GMA 3100
*Integrated video is not available if a graphics card is installed
•Integrated graphics using Intel GMA 3100
•Also supports PCI Express x16 graphics cards*

Make sure the 9500 GS video card is all the way down in it's slot.

The monitor must be plugged into the video port for the video card, on the bracket in a slot space farther down on the back of the case, NOT the video port up higher on the back of the case where most of the ports are, which will NOT produce video when there is a video card in the PCI-E x16 slot.

As OtheHill stated...
"If you have an add in graphics card, it may require a dedicated power connector as well."

Your model probably came with the 9500 GS video card. I checked to see how much capacity your power supply must have when the card is installed. It should work fine with your system's original 350 watt power supply, or any power supply with a 300 watt output capacity rating or higher.

If the 9500 GS video card has a power socket, there must be a connector from the power supply plugged into that socket, that fills the socket.

Make sure your ram is all the way down in it's slots.

When the 24 "pin" connector, or the two connectors - 20 "pin" and 4 "pin" - from the power supply are plugged to the 24 pin main power socket on the mboard, and the 4 "pin" connector is plugged into the 4 pin power socket on the mboard, when the power supply has AC power to it and when it's power switch on the power supply itself is in the ON position if it has a switch, there is probably an led on the mboard surface that is supposed to light up even when the computer is not running.
If that led is not lighting up, you probably have the switch on the power supply itself in the wrong position.

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December 8, 2011 at 16:28:40
Yes! 5th time's the charm. Ntot sure but does looks like it was some kind of loose connection problem; it works now with the new power supply. Thanks to everyone for all your help, much appreciated.

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