Wifi suddenly not working on desktop PC, no matter what

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.
Daniele BrunengoIT Consultant, Web DesignerAsked:
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William FulksSystems Analyst & WebmasterCommented:
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.
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JohnBusiness Consultant (Owner)Commented:
Bad memory as above or some issue with the motherboard.  Vendor diagnostics should tell you what is wrong
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N8iveITCommented:
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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nobusCommented:
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.....
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Daniele BrunengoIT Consultant, Web DesignerAuthor Commented:
It passed all tests. I found an old PCI card that works, though.
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Daniele BrunengoIT Consultant, Web DesignerAuthor Commented:
It can't be a virus, as I stated in the description the problem is there even on a fresh Windows 10 installation.
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nobusCommented:
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
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Daniele BrunengoIT Consultant, Web DesignerAuthor 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.
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JohnBusiness Consultant (Owner)Commented:
Try a different card on a different frequency
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Daniele BrunengoIT Consultant, Web DesignerAuthor Commented:
I've found an old PCI card which seems to work.
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nobusCommented:
was the old one onboard?
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Daniele BrunengoIT Consultant, Web DesignerAuthor Commented:
No, it was another PCI card.
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nobusCommented:
ok - good you found it
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Daniele BrunengoIT Consultant, Web DesignerAuthor 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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