Question about HP ATX-300-12Z (ATX30012ZBD) 300-Watt Power Supply

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Green light flashes on the back of my HP Pavilion 1270 when I connect the power cable but the desktop doesn't start up ( totally dead) . I assume it is the power supply , so I can buy a new one, but how can I be sure that's the problem ? kind regards Bart

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It sounds like the power has failed or is failing. This link will take you to the HP site: http://h10025.www1.hp.com/ewfrf/wc/document?docname=bph06788&cc=us&dlc=en&lc=en&jumpid=reg_R1002_USEN#bph06788_section_2
You can try to un-plug the main power connection to the motherboard and then re-connect it. BE SURE THAT THE COMPUTER POWER CORD IS DISCONNECTED! If that fails, you will need to replace the power supply as indicated on the HP site. The last one I bought was about $35.00.
Good luck and please let me know how it works out for you.
~Spoem

Posted on Mar 26, 2011

Testimonial: "thankx Spoem, after posting this cry for help I searched the same site and found the same answer. Tomorrow to the store to buy a new power supply!"

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1 Answer

Green power supply light is flashing so power is getting to the computer, however the computer will not start from start button. Have removed case and tried ***** start button. Didn't work. Comput


Power getting to the computer/Power Supply?
Yeah.

Power Supply good? -> NO

A) IF ALL of the LED lights were on at once, they would use less than 1 Watt of power.

B) EACH fan uses 2 to 3 Watts of power.

C) A typical Processor can use from 51 to 125 Watts of power.
Just depends on what Processor it is.

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(Operates Up To a frequency rate of 2.4GHz)

http://h10025.www1.hp.com/ewfrf/wc/document?lc=en&dlc=en&cc=us&docname=c00280647

http://en.wikipedia.org/wiki/List_of_amd_athlon_64_microprocessors#.22Newcastle.22_.28CG.2C_130_nm.29

Can use up to 89 Watts of power.

Your Power Supply doesn't even have enough power to spin fans, much less start the Processor.

Want to test the Power Supply? Have a multimeter?
No? Have a power supply you can borrow for a test unit?
KNOWN to be good, and Compatible?

For additional questions please post in a Comment.
Regards,
joecoolvette

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