Windows 10: WIFI Disappeared and Ethernet Cannot Work

I have been using my Windows 11 for a week now with no major issues after I had changed my hard disk. Suddenly today, my internet became extremely slow and I switched my PC to Flight Mode. After I switched it back, my WIFI options has disappeared completely from my PC.I tried to plug in with wire by Ethernet and it still does not connect to the internet. It shows "connected" but it actually isn't. i.e. browsing will lead to a failed page, email will fail to connect, dropbox doesn't sync etc.I tried to do a system restore to the earliest date when PC was normal, still the WIFI option doesn't

:)

 

WIFI Works, Ethernet won't

OK but why?

NOT YELLING, JUST EMPHASIZING

Please note, I installed the new Lynksis, it worked just fine for 3-4 days on both my MACBOOK PRO when in ethernet connect and the Dell, then the ethernet just quit working for both my MacBook Pro and Dell desktop. It did work, then just quit for no apparent reason. WIFi for iPhone, iPad, Andriod Phone, and when I set to wifi for my MacBook pro all work fine.

Detailed history: I first noticed that on my Desktop dell that is CAT5 ethernet connected to the WIFI ROuter, that it stopped, no internet access. I began to trouble shoot, and turned off my WIFI on my MAcbook and it wouldnt work either, plugged into same router but different cat5 cable. At that time, all WIFI devices still worked. I figured that it must be the ethernet side of the WIFI router, so I replaced the router with brand new one. the Lynksys N900 listed in original thread. Ethernet and everything worked just fine for 3-4 days. But then ethernet quit, but wifi still works.

Whatever the problem, it affects both my MacBook Pro and Dell with WIN 7. I'm guessing it is NOT a computer problem, if it is it is affecting both my Mac and Dell, separate cat 5 cables to same wifi router

To remixedcat, I don't know for sure how to check IP settings, see above post, no damage apparent to anything.

 

WIFI Works, Ethernet won't

WIFI Works, not ethernet. I have a MacBook Pro and a Dell WIN 7. Ethernet stopped working, replaced WIFI Access point. I replaced the wifi access point, and for several days, it worked! But then about a week later, I can still connect wifi just fine with all devices, but not ethernet. Frustrated in Hobart*Bang Head :banghead:

New WI-FI Router Lynksys N900 Model # EA4500-NP NEW/Replaced MOdem
Modem Motorola Surfboard SB5101U

 

Wifi stops working when using ethernet

If the computer is unplugged from the ethernet, does the wifi work?