Wifi suddenly not working on desktop PC, no matter what

Daniele Brunengo
Daniele Brunengo used Ask the Experts™
on
Hello, I have a customer PC which behaves in such an incomprehensible way I had to post it here.

Here's the facts: it's a desktop with Windows 10 and a PCI wifi card.

Wifi used to work, now it suddenly has stopped. It will connect and receive ip and dns through dhcp, but won't even ping the router.

And here, the strange stuff begins: I tried in my office and it worked. Cleaned it up, reset winsock and tcpip, brought it back. Doesn't work.

So I tried with a usb wifi adapter. Same behaviour.

I decided to format and reinstall Windows 10. And here's what totally blew my mind. Now it has the same behaviour in my office too, with the usb wifi adapter (still haven't tried with the pci card). It's a frakking fresh install for criminy's sake!

I honestly don't know what to think.
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William FulksSystems Analyst & Webmaster

Commented:
Run some diagnostics on that PC and make sure you don't have some bad memory or a motherboard going out. I'm leaning toward bad RAM but you never know.
JohnBusiness Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018

Commented:
Bad memory as above or some issue with the motherboard.  Vendor diagnostics should tell you what is wrong
Do you have another PCI WiFi adapter to test (preferably completely different vendor)?

However, I'm with John / William, sounds universal enough to say it is RAM / MB.
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Top Expert 2013

Commented:
if it moved to your office - that looks like a virus - run an AV scan !
though i don't know how that moves with an usb wifi adapter.....
Daniele BrunengoIT Consultant, Web Designer

Author

Commented:
It passed all tests. I found an old PCI card that works, though.
Daniele BrunengoIT Consultant, Web Designer

Author

Commented:
It can't be a virus, as I stated in the description the problem is there even on a fresh Windows 10 installation.
Top Expert 2013

Commented:
well i did not say it was that - only that it looked like one
anyhow - then it looks like a bad wifi card; i suppose it's onboard?  then check if it is enabled in the bios
Daniele BrunengoIT Consultant, Web Designer

Author

Commented:
The problem is there both with a wifi pci card and two different wifi usb receivers. That's what makes it so mind boggling.
JohnBusiness Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018

Commented:
Try a different card on a different frequency
Daniele BrunengoIT Consultant, Web Designer

Author

Commented:
I've found an old PCI card which seems to work.
Top Expert 2013

Commented:
was the old one onboard?
Daniele BrunengoIT Consultant, Web Designer

Author

Commented:
No, it was another PCI card.
Top Expert 2013

Commented:
ok - good you found it
IT Consultant, Web Designer
Commented:
So, it's not a real solution since I don't really found out what happened, but the current card works, so I'll settle with that.

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