interesting computer boot problem, need help

Sep 17, 2018
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i have a very interesting problem thats getting to me. i have an HP Desktop PC Pavilion 500-c60, running on windows 10. i booted it up and logged in, and went to do something for about 30 minutes. when i got back, the monitor was black (i assumed it was in sleep mode). i tried to wake it up by pressing buttons and wiggling my mouse, nothing worked. the power button did not shut the pc off, so i pulled the plug. when i try to turn it on, hard drive powers up, fans spin, and everything seems okay except it wont post. things ive tried: resetting the cmos, reseating the ram, disconnecting everything except mouse/keyboard, a different monitor, and turning off the system and draining of power. nothing works. holding the power button does not turn it off either, and the LED in the power button does not turn on.
 
Sep 17, 2018
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I have tried booting into just the bios without the hard drive connected. also i should mention no power goes to the USb ports
 
Sep 17, 2018
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the "psu" is an external brick-- the power connects directly to the motherboard
 

shknawe

Respectable
Oct 22, 2016
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Get a can of keyboard cleaning air and spray the hell out of motherboard, psu, any cooling fans etc. Then retry starting it. It sounds to me like you have a dust arcing going on from dirty computer inside.
 
Sep 17, 2018
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i tried a few keyboards, and i cleaned the heatsink/fans thoroughly. i even replaced the thermal paste just about 3 months back when i reassembled the thing. and again, the power supply is an external brick, so that cant really get dusty enough to cause a problem
 
Sep 17, 2018
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i doubt it, it is secured to my desk and cannot move, and it was working just 30 minutes earlier, nothing was running when the problem started
 
Sep 17, 2018
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the system would not boot with a guaranteed working stick of ddr3 from my main rig, and the cpu is soldered to the motherboard
 
Sep 17, 2018
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+ if it was the cpu/motherboard, the fans would spin out of control (i think). they are running at a normal speed though
 

Ralston18

Titan
Moderator
Proprietary I think....

Not sure how to troubleshoot unless you happen to know someone with an identical "brick" and wires.

May be able to test the brick's output if you know how to safely do so and have a multimeter. Or again, someone who can help with that as well.

Last resort would be to purchase a replacement brick etc... Hope being that the problem is indeed the power brick.

No guarantees....
 
Sep 17, 2018
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I dont think the power supply is the problem. just to verify this, i tried it on a laptop that uses the same connector, and it charged properly
 

Ralston18

Titan
Moderator
Good - if the brick and power cables work elsewhere then you have most likely narrowed down the problem to being within your desktop.

However, charging a laptop is not the same as providing the necessary power to a working desktop.

Not being able to post - could be the motherboard.


 
Sep 17, 2018
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its not a very powerful desktop-- there are many laptops with the same processor (a6-5200). and how would the motherboard break from being idle? thats why this whole situation is confusing me so much haha
 

Ralston18

Titan
Moderator
Electronics are subject to constant heating up and cooling down. Expansion and contraction.

Things become brittle as a result. Then break.

Only takes one little tiny component to die and some part or all of the motherboard is done for....



 
Sep 17, 2018
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yes i checked with only 1 ram stick installed, one from my main rig that i know works, and i tried it in both slots. every test i did i unplugged it then held the power button down for 15 seconds. i then plugged it in and left it to run for about 2 minutes before testing another variable
 
Sep 17, 2018
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none of the caps are blown, there are no burn marks, the fan was on, if the motherboard really failed when doing nothing im never buying from hp again
 

techiebee18

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Aug 20, 2018
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You have mentioned that the system displays a black screen automatically. Verify if the power outlet is working correctly. As you are running your system on Windows 10 OS, it has two options-Hibernate and Hybrid Sleep mode. Check if any of the modes are enabled. If yes, disable it and check if the system works properly.
 
Sep 17, 2018
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nope i already tried a different outlet
 

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