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Pastimes : Dream Machine ( Build your own PC )
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To: SIer formerly known as Joe B. who wrote (13560)8/4/2002 10:28:24 PM
From: Robert Graham  Read Replies (1) of 14778
 
Looks like the cause of my problems was the power supply, specifically my UPS (Uninterruptible Power Supply). When I have new hardware start to go bad on me, from different vendors and places of purchase, then the common element is the power. This can explain the following problems I have had:

1. Memory not running to spec
2. First video card blew out, second card with late video signal
3. Changes made to hardware "improved" but did not solve problems. This includes the swap of the new motherboard
4. A new TDK VeloCD drive now causing generating errors using the Nero test utilities.
5. An apparently bad new 40G drive that is now junk.

I now have second thoughts that a bad ball bearing could of introduced high frequency noise that damaged the hardware components, even though I have not entirely ruled this possibility out. But this new thinking would mean my old UPS is no longer filtering the power, or superimposing its own noise onto the power that goes to the PSU (Power Supply Unit) of the computer. The only other hardware that has not been changed is the CPU itself.

Problems due to high frequence power noise is the most difficult and costly problem to troubleshoot. Even when the noise is removed, or the inoperative power filter is removed, the problem persists, possibly even getting worse. For the damage is already done. This problem may have caused me to replace good CD Burner, good motherboard, and a good hard drive. The cheap generic memory may have still caused problems. And the PSU of the computer definitely did not deliver its rated outputs and wattage. But both may have just only aggravated my problems. I just hope my part replacing has come to an end, now that the system has been thoroughly tested and found to operate 100%.

I will have the UPS tested in the future. Apparently this is a model that does not convert AC to DC and then back to AC as a way to completely isolate the PC from the wall power source. This feature must be reserved for the more expensive units. I know the unit itself has performed through several years of many significant lightening storms. Perhaps it is time to replace it.

Any thoughts?

Bob Graham

PS: Lets hope I will not end up having to replace the CPU too!
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