What you describe are a PRAM reset:
and SMC reset:
I would do them again, but first check SMART, run Repair Disk, and Repair Permissions:
First check the S.M.A.R.T.status on your HD: Applications > Utilities > Disk Utility > in thepanel at left, select the first item in the list/your HD mechanism > look atthe bottom of the main window next to S.M.A.R.T. status and see if it says“Verified” or something more ominous like “Failing.”
If S.M.A.R.T.status is "Verified," run Repair Disk: Boot from install disc (insertdisc > restart > immediately hold down c key and keep holding it untilyou see “Preparing Installation”) > at first screen select the language andclick Continue > click on the Utilities Menu in the menu bar > open DiskUtility > select your HD in the panel on the left side> click Repair Diskat bottom of main window. Run this at least twice, and keep running it until itsays “appears ok” twice in a row. If that doesn’t happen, you may need astronger utility such as DiskWarrior or if the directory is damaged beyondrepair, you may need to reinstall the OS, or you may have a damaged HD (repairutilities can only repair the directory structure, not the HD itself). Whenthis is finished, quit Disk Utility, quit the installer, and restart. Oncebooted normally, go to Applications > Utilities > Disk Utility and runRepair Permissions.
Also, do you have at least 15% free space available on your HD?
Insert install disc
Immediately hold down the c key and keep holding it until you see “Preparing Installation”
At this point you will be booted from the install disc
Continue following the directions I posted in my earlier post
What kind of backup do you have on your external HD? Time Machine? CarbonCopyCloner? SuperDuper!?
Ok - so for my 15 in. MacBook Pro with the same problem - I first used tjk's suggestion to check S.M.A.R.T. then v86's PRAM reset and IT WORKED (I feel sooo smart now - haha) thank you so much for your suggestions and wisdom! I am very glad I did not have to take to the Apple hospital by the way I had to look this up on my "baby mac" which is my 2005 little white 13 in. MacBook -which STILL WORKS AND IS GREAT (so long as it's plugged into the power source as the battery died last year).
I have the same problem , I bought a Wifi usb adapter, but it doesnt comes with instructions for Mac
After the Airport card not installed problem , I had someone update my mac software to mountain lion, and it turns that the Wifi icon disapeared completely from the upper right side of the screen ( I dont have any more the airport card not installed problem)
Do you know , or any one, if the usb will still work?
I hope its not an obvious answer but I really have no idea
I am using the USB Wifi card and seems to be working fne. Its the cheapest solution.
I spnt a lot of money trying to fix it. repalced the card to find out its the antena in the monitor and have to change the screen. The apple tech basically told me to buy a new computer.
it wa s bit ahrd to figure out since all the instructions are for windows but i did get it working.