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Windows 7: Front USB ports not working, but rear USB ports work…

22 Jul 2013   #11
Britton30
Microsoft MVP

Windows 7 Ultimate X64 SP1
 
 

I agree on cheap PSUs. While they may work fine with some loads and hardware they can, and do, feed "dirty power". That is fluctuating and not quite converted to DC, still has some AC present. They can overheat trying to keep up too. Their voltage regulation leaves a lot to be desired and could feed 13-14V and start frying components. It's like buying a Ferrari and putting a Ford Escort engine in it.


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23 Jul 2013   #12
0pTicaL

Windows 7 Ultimate x64 SP1
 
 

Quote   Quote: Originally Posted by fireberd View Post
Dell power supplies tend to be under-rated. e.g. a 300 watt Dell OEM power supply is more like a 350 to 375 watt power supply - and has very good DC voltage regulation.

I've been in electronics (I was the Ampeg guitar/bass amplifier factory repair tech in Nashville at one time) and computer maintenance since before PC's. I've seen motherboard failures that were traced to cheap power supplies. I used to do a lot of user support on the Dell forums and we saw a lot of hardware (motherboard) failures caused by users that used cheap power supplies in their Dell.
Depends on which Dell PSUs you're referring to. The ones I've seen used in low end Dells and EMachines with are from Bestec and when it goes it tends to take the main board along with it.

Quote   Quote: Originally Posted by Britton30 View Post
I agree on cheap PSUs. While they may work fine with some loads and hardware they can, and do, feed "dirty power". That is fluctuating and not quite converted to DC, still has some AC present. They can overheat trying to keep up too. Their voltage regulation leaves a lot to be desired and could feed 13-14V and start frying components. It's like buying a Ferrari and putting a Ford Escort engine in it.
Speaking from experience, a local PC shop I used to work for purchased these by the hundreds and during the 2 years I worked there only 3 failed. That's why I continue to use this brand.

I hear the same stories about cheap PSUs on the web all the time. The thing is, we never hear about the millions of cheap PSUs that do work, we only hear about the ones that don't work. Besides, all the reviews and bad things people hear online about cheap PSUs are reviewers intentionally pushing the PSU beyond it's limits. Under normal usage no PSU will be pushed to such limits.

I'm not rallying for cheap PSUs I'm just pointing out, from experience, that cheap PSUs aren't as bad as people think.
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23 Jul 2013   #13
Britton30
Microsoft MVP

Windows 7 Ultimate X64 SP1
 
 

Ahem, well....anyway, how about the USB issue?
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23 Jul 2013   #14
0pTicaL

Windows 7 Ultimate x64 SP1
 
 

Waiting on the new case to arrive.
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23 Jul 2013   #15
Britton30
Microsoft MVP

Windows 7 Ultimate X64 SP1
 
 

Couldn't find a USB panel to test it with?
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27 Jul 2013   #16
0pTicaL

Windows 7 Ultimate x64 SP1
 
 

I have a bunch of old USB 2.0 brackets lying around, but it's not worth the gas to drive 40mins to the client's house just to test it and drive back.

Anyways, the problem was with the USB cable, replaced it and it's working now.

Thanks for all the input guys! Rep+
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28 Jul 2013   #17
Britton30
Microsoft MVP

Windows 7 Ultimate X64 SP1
 
 

Good sleuthing. Was it the cable from the front panel?
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28 Jul 2013   #18
0pTicaL

Windows 7 Ultimate x64 SP1
 
 

Yes
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 Front USB ports not working, but rear USB ports work…




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