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kstindc
Posts: 10
Member Since: ‎04-25-2009
Message 1 of 5 (3,142 Views)

Pavilion d4999t will not power on after power failure

After a general power failure last night, my HP Pavilion Ultimate d4999t CTO will not power on. The LED on the power supply is green, but pressing the power button on the front of the chassis does not start the computer. I have unplugged the computer and let it sit for 10 minutes, then tried again.

How do I determine whether I need a new power supply or the motherboard has been damaged? Is this something only a technician can find?

Thanks,
-stephen
Washington DC

 

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Big_Dave
Posts: 20,325
Member Since: ‎07-17-2009
Message 2 of 5 (3,113 Views)

Re: Pavilion d4999t will not power on after power failure

Hi,

 

Try the following procedure and see if you can isolate the issue.  Don't skip any steps.

 

 

 Trouble Shooting Power Supply Issues.

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HP e9280t, i7-960, 12GB, Vertex 3 120, ATI 4850
HP DV9700, t9300, Nvidia 8600, 4GB, Crucial C300 128GB SSD
HP Photosmart Premium C309G, HP Photosmart 6520
HP Touchpad
Custom i7-4770k,Z-87, 8GB, Vertex 3 SSD, Samsung EVO SSD, Corsair HX650,GTX 760
Custom i7-4790k,Z-97, 16GB, Vertex 3 SSD, Samsung EVO SSD, Corsair HX650, GTX 660TI
Windows 7/8 UEFI/Legacy mode, MBR/GPT
Tutor
kstindc
Posts: 10
Member Since: ‎04-25-2009
Message 3 of 5 (3,101 Views)

Re: Pavilion d4999t will not power on after power failure

I followed all of the steps and still no joy. I discovered that even with the green LED, the fan in the power supply is not turning. I have ordered a replacement power supply by part number 5188-2859 or DLT350AB-8 A (seems to be a standard) from http://www.itwinkle.com/hp35posu51.html for $36 plus $11 shipping.

 

The power outage zapped one of my HP Media Vaults, too, and several nieghbors lost gear.

 

I'll reply when I have the new power supply installed.

 

-stephen

Washington DC

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Big_Dave
Posts: 20,325
Member Since: ‎07-17-2009
Message 4 of 5 (3,094 Views)

Re: Pavilion d4999t will not power on after power failure

[ Edited ]

Hi,

 

The fan in some of the new power supplies is thermally controlled.  I doubt that the HP PSUs are that sophisticated.  I hope tthe replacement PSU solves your issue.

---------------------------------------------------------------------------------------
HP e9280t, i7-960, 12GB, Vertex 3 120, ATI 4850
HP DV9700, t9300, Nvidia 8600, 4GB, Crucial C300 128GB SSD
HP Photosmart Premium C309G, HP Photosmart 6520
HP Touchpad
Custom i7-4770k,Z-87, 8GB, Vertex 3 SSD, Samsung EVO SSD, Corsair HX650,GTX 760
Custom i7-4790k,Z-97, 16GB, Vertex 3 SSD, Samsung EVO SSD, Corsair HX650, GTX 660TI
Windows 7/8 UEFI/Legacy mode, MBR/GPT
Student
sirgas
Posts: 1
Member Since: ‎05-30-2012
Message 5 of 5 (2,991 Views)

Re: Pavilion d4999t will not power on after power failure

[ Edited ]

Here's what worked for me to get the system to boot.

 

  1. Unplug power cord from the wall
  2. Then unplug the motherboard p1 connector (that is the big connector from the power supply)
  3. Wait 5 minutes until green light stops flashing, allows capacitors to discharge, and magic happens
  4. Plug the power cord back into the wall and it should now have a solid green light on the back. 
  5. Now plug in the motherboard connector. Yes , apply power first, then connect the motherboard
  6. Power on the system!

I forgot to mention, this all started after an unplanned power outage.

 

The only problem, every time I unplug the computer, I have to do this procedure to make it boot again. Shutting down the computer normally, and leaving it plugged into the wall, I have no issue.  Any thoughts on whether this is a motherboard issue, a power supply issue or something else?

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