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  #1 (permalink)  
Old 28-01-2009, 04:10 PM
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No boot up
Computer was turned off. Next day nothing. No fans, no lights. Nothing working. I tested the power supply. OK. Can a power supply be bad, but test ok. Most computer I have this problem with is a bad power supply. I'm looking at MB next.
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Old 28-01-2009, 05:08 PM
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Re: No boot up
Quote:
I tested the power supply. OK. Can a power supply be bad, but test ok.
Depends on how it was tested. The correct way to fully test a power supply is while under a realistic load with some form of waveform analyzer (oscilloscope or power analyzer) by a trained technician. A volt-meter is not good enough. Short of that, you swap in a known good, properly sized, power supply. I also keep a FrozenCPU Ultimate PSU Tester for PSU testing in my tool bag when I am away from home. It is not as good as a qualified technician testing the PSU under a "true" (realistic) load with an oscilloscope or power analyzer, but close.
Quote:
I'm looking at MB next.
Only if sure it is not the power supply. How was it tested?
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Old 28-01-2009, 08:07 PM
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Re: No boot up
I have a power supply tester. The tester showed the power supply ok. With the tester the case fans work ok. I know with computers anything can happen & will sooner or later. I used my last power supply the other day. I try to keep one on hand.
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Old 29-01-2009, 03:35 AM
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Re: No boot up
The testers are not good enough. They can still show a supply as good, when it is not. They do not show the ripple value, which if too high, can cause stability issues. And they do not present a realistic load.

Although your symptoms can be caused by other things - bad RAM, bad CPU, bad motherboard, it points to power. And you need to verify that before preceeding.
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Old 29-01-2009, 03:41 PM
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Re: No boot up
I think power supply is the problem. Thanks for your help. I try to keep a power supply on hand. Will get one & see. Thanks
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Old 29-01-2009, 07:21 PM
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Re: No boot up
Good luck and keep us posted.
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Old 06-02-2009, 02:51 PM
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Re: No boot up
For the time being the new power supply is up & running. Now I have one of the computer from the church. I have a feeling power supply is bad. Something new with each computer that you try to fix. Thanks for your help.
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Old 06-02-2009, 03:57 PM
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Re: No boot up
Quote:
Something new with each computer that you try to fix.
That's the fun part.
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Old 22-02-2009, 06:50 PM
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Re: No boot up
The new power supply for the computer from the church has it up & working. Two difference computer problems, but power supply fixed computers.
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Old 22-02-2009, 11:01 PM
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Re: No boot up
Well you gotta feed electronics good food! Thanks for the followup.
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