power supply vs motherboard

Frank Avallone · 03-19-2008, 05:18 AM

cpu, HP Pavilion a520n, was working well.Hit power switch to turn on , no response. No power to cpu.Checked all power cords and outlets . A ok for all. monitor powers up, on separate power source. Question arising.
1.is power switch bad ?
2 is power supply bad?
is mother board bad?

No audible sounds heard prior to problem. Unit working well day before.
When pressed p0wer switch to turn on, button lit up for split second and then unit died.
How do I proceed to solve problem?

ajcstr · 03-21-2008, 09:08 AM

I had the same issue with an emachines. First thing I did was replace the power supply - when that did not fix the problem, I replaced the motherboard.

What had happened I guess was the power supply went bad and took out the motherboard. For $6 or so, you can get a power supply tester, but my old power supply tested good, it just fried the mobo so I replaced both.

dai · 03-21-2008, 09:32 AM

remove the 2 wires from the front button at the m/b then touch the 2 pins with a small scredriver for a fraction of a second
this will check if it is a faulty button

ajcstr · 03-21-2008, 09:40 AM

Quote:

Originally Posted by dai

remove the 2 wires from the front button at the m/b then touch the 2 pins with a small scredriver for a fraction of a second
this will check if it is a faulty button

Can a hard drive jumper be used to do this also???

dai · 03-21-2008, 09:48 AM

you only touch them together for a fraction of a second not a permanent bridge

ajcstr · 03-21-2008, 09:53 AM

Quote:

Originally Posted by dai

you only touch them together for a fraction of a second not a permanent bridge

Understood, but holding the jumper with a needlenose..... touch and pull out

03-19-2008, 05:18 AM	#1 (permalink)
Frank Avallone Registered User Join Date: Mar 2008 Location: silver sping , MD Posts: 1 OS: win xp pro	power supply vs motherboard cpu, HP Pavilion a520n, was working well.Hit power switch to turn on , no response. No power to cpu.Checked all power cords and outlets . A ok for all. monitor powers up, on separate power source. Question arising. 1.is power switch bad ? 2 is power supply bad? is mother board bad? No audible sounds heard prior to problem. Unit working well day before. When pressed p0wer switch to turn on, button lit up for split second and then unit died. How do I proceed to solve problem?

03-21-2008, 09:08 AM	#2 (permalink)
ajcstr Registered User Join Date: Jan 2005 Posts: 34 OS: 98/XP	Re: power supply vs motherboard I had the same issue with an emachines. First thing I did was replace the power supply - when that did not fix the problem, I replaced the motherboard. What had happened I guess was the power supply went bad and took out the motherboard. For $6 or so, you can get a power supply tester, but my old power supply tested good, it just fried the mobo so I replaced both. Last edited by ajcstr; 03-21-2008 at 09:10 AM.

03-21-2008, 09:32 AM	#3 (permalink)
dai Manager, Hardware Forums Join Date: Jul 2004 Location: west australia Posts: 56,595 OS: win 7 32x 64x rtm	Re: power supply vs motherboard remove the 2 wires from the front button at the m/b then touch the 2 pins with a small scredriver for a fraction of a second this will check if it is a faulty button __________________

03-21-2008, 09:48 AM	#5 (permalink)
dai Manager, Hardware Forums Join Date: Jul 2004 Location: west australia Posts: 56,595 OS: win 7 32x 64x rtm	Re: power supply vs motherboard you only touch them together for a fraction of a second not a permanent bridge __________________