I blame PSU ,the service blames HDD

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tester11

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Jun 29, 2017
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In the past when I start the desktop it tries to start 3 times and fails,only the third time succeds.In the last days it shuts down randomly at first 10 minutes since it starts.Yesterday it only enters in BIOS and says to insert disk .The service says that is the HDD fault and they made me buy and 1TB HDD.I bought it and then tried to use the 'broken' HDD on other pc and worked then tried with the normal desktop and worked too but still restarts.I didn't used the new HDD because I think that the PSU has problem not the HDD and I want to return it.

Am I wrong?Can those restart problems be from HDD ? The service said that the HDD is broken and data is lost and that is false.
 
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InvalidError

Did they use an oscilloscope, an appropriate set of loads to duplicate the sort of transients that the PSU will see under typical operation and then test for noise and transient response at various load levels to verify that everything remains within specs under all tested circumstances? If the answer to any of these questions is no, then the service company didn't test the PSU correctly and doesn't know with any sort of certainty that the PSU is genuinely still good.

What most shops do is hook up a dumb voltage tester that only checks whether output voltages are within 5% or so from nominal, which is useless beyond identifying PSUs that have already gone...
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InvalidError

Titan
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May 18, 2007
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A bad HDD could possibly short out the PSU but if you had such a malfunctioning HDD, I doubt you'd be able to do anything with it.

On the other hand, there are no limits to the problems a bad PSU could cause. Weird and unpredictable boot behavior is at the top of that list. What's the brand and exact model of the one you currently have? Generic PSUs and cheap models from many better-known brand are of poor to horrible quality. If you choose to change the PSU, make sure you get a decent model from a reputable brand. A good place to start would be Seasonic S12-II series which can often be found for ~$40. Very few PSUs come anywhere close in performance and quality for that price.
 
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tester11

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Jun 29, 2017
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Yeah it's cheap,it's an RPC 500W. If ,let's say, the HDD is the problem,is it safe to clone it to the new HDD?
 
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InvalidError

InvalidError

Titan
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May 18, 2007
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I wouldn't trust a generic PSU of unknown origin and quality much further than I can throw them so I'd start with replacing the PSU with something of decent quality first and worry about the HDD next if that doesn't solve your problem.

Your possibly PoS PSU might be killing your HDD and cloning your HDD to a new HDD would just hide the symptoms for a while longer until the PSU kills your new HDD as well and possibly the rest of your system.
 
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tester11

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Jun 29, 2017
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The service said that PSU works fine.I will consider changing the PSU then.

But I just want to know if the problems with the reset can be only from HDD.I had a lot of power cuts last days and maybe that made the HDD fail
 
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InvalidError

InvalidError

Titan
Moderator
May 18, 2007
23,815
5,265
108,890

Did they use an oscilloscope, an appropriate set of loads to duplicate the sort of transients that the PSU will see under typical operation and then test for noise and transient response at various load levels to verify that everything remains within specs under all tested circumstances? If the answer to any of these questions is no, then the service company didn't test the PSU correctly and doesn't know with any sort of certainty that the PSU is genuinely still good.

What most shops do is hook up a dumb voltage tester that only checks whether output voltages are within 5% or so from nominal, which is useless beyond identifying PSUs that have already gone grossly out of specs under very light or no load.

If the HDD failed, no amount of rebooting would fix it with any sort of repeatability. When hardware other than PSUs fail, it usually stays dead until something is done to repair it.

Dying PSUs on the other hand have a large random factor in how they power up and respond to transients which can cause them to occasionally power up after repeated failed attempts at turning them on. When devices that used to work perfectly decide to randomly refuse to power up, it is almost always a PSU-related issue.
 
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