Question about HP Pavilion a1120n (PX759AA) PC Desktop

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CPU fan turns for a few seconds and stops, pc will not turn on. Have tried a good PSU, same issue. Removed all connection to motherboard apart from 20 pin, 4 pin power + cpu fan and PW switch: same issue.

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1. First of all Remove dust from your CPU fan and try again if issue has been not resolve

2. Second test your SMPS by the help of Green & Red wire. In case fan is turning properly it mines your SMPS is ok

3. Third & last kindly replace your SMPS For the same.

Posted on Nov 19, 2009

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First check the power supply or swap another.
Clear CMOS jumper or remove the battey
connect only power 20 or 24 connect and test power on. no off? (no video because no power to cpu by 4 pin or 6 pin connector)
plug 4 pin connector and test power on. if on and off check cpu power section (mosfets) if burned one pls remove ... you can test short by touch the mosfet by finger (burning heat)

Posted on Oct 11, 2016

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Posted on Jan 02, 2017

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HP media center pc ,1170n will not boot. black screen. You can hear the fan come on but black screen.


Sounds like a capacitor has blown on the motherboard, but before condemning it, check the following:
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(This indicates that power is at least getting to the CPU
2.) Check connections of ALL the main power connectors (ie: the 20/24 pin plug to the mainboard and the smaller 4 pin plug to the mainboard.
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Good day.
You are down with your motherboard as the main suspect of the problem. To isolate it, remove all the devices (hard disk, optical drive, video card, memory) that is connected to your board. Turn-on your PC. If your PSU is still acting abnormal then your motherboard is defected and you need to buy a new one, else, you can replaced one at a time the devices you have removed earlier.
Feel free to post again here at Fixya if you still have a problem.
Good luck.

Tedmac

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11_23_2012_3_03_50_pm.jpg

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