Is this a bad power supply or MB ?

[Jsch38]

The computer is a VPR Matix, Series 210,Model Ft-4100:
System would not power on, The power switch would light up, But system would not power on when switch was pressed. Checked power supply with tester and it passed. Then removed power cord and reinserted the cord and turned the switch on the power supply on and off. Tried the power button and the system came back on with no problem.
So I continued to work with customer when the system "Froze" after about and hour of use.. I was running UBCD for windows and copying files from an external drive on USB to another external drive on USB. System would not reboot using Ctrl-Alt-Del sequence. Held down the power switch and the system turned off. Then systen would not power back on .Tried the same steps as menioned above with the power supply switches and system still would not power up. Could this be a power supply issue or maybe a MB issue ?
My next step is to try a new power supply. Thanlks for your help.

 

[compnet]

Could this be a power supply issue or maybe a MB issue ?

I don't know, maybe you should :

try a new power supply.

 

[ElementalWindX]

THIS: http://www.newegg.com/Product/Product.aspx?Item=N82E16899261023

is invaluable in your toolkit. Get that or something similar.


Also simply plugging in another known good power supply can help you solve it....


I have seen power supplies kill power to hard drives after it reaches a certain operating temp. That is extremely rare though. I think it has only happened once maybe twice ever in my experience.

 

[NWPhotog]

THIS: http://www.newegg.com/Product/Product.aspx?Item=N82E16899261023

is invaluable in your toolkit. Get that or something similar.


Also simply plugging in another known good power supply can help you solve it....


I have seen power supplies kill power to hard drives after it reaches a certain operating temp. That is extremely rare though. I think it has only happened once maybe twice ever in my experience.

The power supply testers miss a percentage of bad supplies. The only sure way to diagnose it is to replace the PS and verify if the issue goes away.

 

[16k_zx81]

The power supply testers miss a percentage of bad supplies. The only sure way to diagnose it is to replace the PS and verify if the issue goes away.

Ya. Same thinking here. Just swap it out and re-test. No wiggle-room for error that way.

.

 

[Martyn]

The op mentioned he has tested with a tester but yes change the psu, the only real test especially if you have a permanent fault.

 

[ElementalWindX]

The power supply testers miss a percentage of bad supplies. The only sure way to diagnose it is to replace the PS and verify if the issue goes away.

Very true. All testers I've seen do not put a full load on the power supply either. They rely on you having extra ports to plug in the tester where you can turn on the pc and stress it yourself.

In the end experience is key.

 

[YeOldeStonecat]

I'll put my money on a bad motherboard...specifically bad capacitors.

You can eyeball the motherboard and look for bulging/leaking caps.

If you have a spare power supply around you can swap it to test it....may indeed be a wonky power supply.

Hadn't heard of that brand/model computer, but a quick Google shows that it may be an early Pentium 4 on an 845 chipset based motherboard...puts her smack dab in the peaks years of the black market capacitor issue.

And at that vintage...she's old, not worth the time or expense.

 

[webcam]

yes, you check the psu with a psu tester, but sometime the psu may be ok, but under load the fault may show up. replace the psu with a known good one, if you till got problems, it is the motherboard

 

[Jsch38]

Thanks for all the suggestions. I will post when I have an update.