Lion - WiFi no hardware installed

I got the same issue on a iMac mid2010, i5 4Gb RAM, only when i turn on the bluetooth keyboard before the Mac's grey start screen.
I just tried to reboot and everything went fine.
As far as l learned from my experience, Lion got several and sometimes serious issues. More than SnowLeopard, for sure.

I've had this simmilar problem, i've went to the apple store twice. First they replaced my wifi card. After a week, same problem. Now they replaced my whole screen and i've been up and running for over 2 weeks. No problem.

The thing i'm curious about is how many of you use an external monitor ( non apple ) ( i used samsung syncmaster ) and use a converter for the thunderbolt port? Because after the lion upgrade not only did my wi-fi card started to act strangely but also my monitor didn't work for half the time. At around the same time they started to act strangely.

My feeling says that there might be a connection between the 2. Maybe i'm completely wrong but solving this problem will help alot of people hence i share my thoughts.

I am having the same problem, brand new 27in iMac lion and a restart does work. But it is still a pain in the butt. Please apple fix this!

I have a older Dell 24 in display connected and this problem just happened, now I have this wifi issue plus I can't rotate the second Dell display

So as I had run into this problem in good timing (the semester just began) WIFI: No hardware installed decided to bless me with its unwanted troubles. Now I tried every solution that everyone has posted. Reset this and that, flick on/off this and that. Even tried for giggles changing the firmware to SL. NOTHING WORKED!!

Then I for fun decided to tear apart and hunt for the problem in the hardware.

http://www.ifixit.com/Guide/Installing-MacBook-Pro-13-Inch-Unibody-Mid-2010-AirP ort-Card/6024/1

I followed those instructions and took apart the display to get the airport chip. I got to it with no problems at all. the black clutch was a bit tricky. But I digress. I took the airport chip out. blasted it some compressed air, cleaned the connectors( i used one of those rubbing alcohol pad and LET DRY). Put the everything back together. I left everything torn apart for a good 20 minutes.

Boot it up.

Saw the WIFI symbol up top and Bada Bing it asked me to install the "new airport card" to get it functioning. So far its working like a charm no problems. NO MORE WIFI No Hardware installed !!!!!!!!!!!!!!

Just to add to the discussion on this problem, I have been experiencing the isue exactly as described by OP and atgrazi (amongst others). This is on a mid 2011 iMac with Lion 10.7.2, so it does not appear to have been resolved with this upgrade to Lion as indicated by dogweather.

I've spent an hour x2 on the phone to Apple Care today and finally got transferred to one of their senior technical staff who confirmed that this was a known problem, that the recommended "workaround" is exactly as described by atgrazi, and that they hope their technical team will be able to address the issue with (what I suspect will be) a firmware fix within a future update.

Just to repeat the official Apple advice - keep your wireless mouse/keyboard off (or don't wake from sleep mode if you leave them on when you switch off you computer) until you see the grey apple logo and the rotating 'dial', then switch them on/wake them and you should have a fully operational system.

Jon

I have the same issues, but it includes my Battery not CHARGING, the Light just goes off after 5 or 10 mins. Have to switch off and Switch on to start the Charging again. Am tired of the WIFI issue too.
I have done all the RESETTING of SMC and PRAM after upgrading to Lion. I have left with no options now, stuck with ETHERNET CABLE 😟

I have a 2008 unibody Macbook. I started getting freezes after installing Lion, then it wouldn't boot past the apple logo. I couldn't run recovery or any disk.

A few times, when it did go in, the wifi showed no hardware found.

I had one last stab at it tonight, I zapped the pram again, which did nothing, then out of curiosity booted holding down D which is supposed to launch diagnostics. What it actually did was boot straight to the desktop with the wifi working!

I've no idea how this worked but it did, I'm just reinstalling Lion now from fresh.

Hope it helps someone else.

2011 early MBP same probs....

had the whole drop problem now dead..

just one problem after another lately...

crazy thing is my pc with 10.5.8 still runs perfect not a prob!

Looks like mine was a faulty wireless card.... Replaced and now hoping had one crash total shutoff but it rebooted fine....

Mattrix, how is the new card working out for you after a couple of weeks of using it? I have a mid 2010 MBP still having "No hardware Installed" problem.

Tony, ye it's working great zero problems on all sorts of people's routers....

I've now had 3 dies/reboots but I don't think that's related more like something else loose or the like when you move it or single hand it to someone.

Hasn't done it all tho lately only the 3 times within the week of getting it back.

good to hear that worked out for you.

I am in a tough boat, my apple care ran out and right now am stuck using a good USB wireless dongle. but as of late i need that USB port back with all my new work.

I know those cards cost a pretty penny too. I might just have to suck it up and buy a new one myself.

the weird thing is my partition of Windows 7 uses the wifi chip just fine. I am just tired of waiting on apple at this point.

$73 from memory I was quite surprised...

Have you tried going back to snow?

Personally Lion is the biggest pile of........

When I get time I'm going back... My MacBooks are now slow and Feel "laden"

whoa!?! where did you find that price at if you don't mind me asking.

I am thinking about going back to Snow Leopard if I can't find a fix by my vacation time.

I love lion for some functional reasons but at the same time i've had all this gestures for long time using better touch tool.

But the most basic thing is not even working which does turn into a big pile of....