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Powering on PC causing modem dropouts

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#1 danny_h69


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Posted 13 September 2017 - 08:11 AM

G'day everyone!


Hopefully someone can give me some assistance as I am all out of ideas.


I have an oldish desktop (about 5 years) that all of a sudden has developed a massive problem,


I am using separate SSD's with WIN10 on one and Linux Mint 18.2 on the other and a 2TB HDD for data, I simply boot into the OS I want when it loads.  Been doing this for quite a while now no problems.  We have about 5 computers in the house (between 2 of us - so not all being used at once).


However, for the last few weeks or so, when I turn on the computer it POST's correctly and it doesn't matter what OS I choose it causes the modem/router to drop out completely.  It re-syncs for 30 secs / 1 min / 5min / etc then drops out again. Wired network.   TP-Link TD-W8968.  This only occurs when I turn this one machine on.


Motherboard is Gigabyte GA-Z77X-UD5H - with 2 onboard network adaptors.


I have done the following:


* Reset/rebooted modem countless times.

* No IP / MAC conflicts that I can see.

* Virus / Malware checked all drives with both Kaspersky and Malwarebytes after removing the drives and using dock.

* Current network drivers.

* Unplugged the Ethernet cable(s).

* Unplugged peripherals except monitor.

* Unplugged all peripheral except the box.

* Unplugged the drives - no peripherals except box.

* Removed CMOS battery and left off (removed power cable) for an hour. And the real kicker...

* Took the now driveless box to another room and powered it up ... POST's and then modem dropout... WTF?


It's been a long day and I'm sure I've missed something obvious to try... any help will be greatly appreciated.



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#2 Wand3r3r


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Posted 13 September 2017 - 10:09 PM

router is failing if the tiniest load causes it to go down.


Not a pc issue

#3 danny_h69

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Posted 14 September 2017 - 06:44 AM

Figured it out (eventually)... after all the fiddling I was confident it wasn't a network issue as such but a power issue.


I plugged the modem/router into the UPS thinking it might be a house power issue, but same result...


Then it clicked... or in this case ticked... my PSU has been steadily ticking away for a few weeks now and I had just gotten used to the sound as it didn't seem to be causing any issues.


Took the PSU out and plugged it into a PSU tester and ... FAIL ...


Luckily I had an almost new Thermaltake PSU on hand and plugged it in... no modem/router dropout... put all the bits and pieces back in the PC, powered up and voila! No drop outs....


Taking the 1-2 year old Antec Neo Eco 520C back to the shop for a warranty replacement.  I was going to just stick with the Thermaltake that's now in the PC except that it only has 3 SATA power connectors. Running without a optical drive at present (not that the're that useful nowdays).


Problem SOLVED.  :thumbup2:

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