Macbook Pro 15 2010 cannot connect to Wifi - also cannot do AHT

[Shed209]

My Macbook Pro 15 (2010 model) is unable to connect to my wifi network even though I am using the correct wifi password. I am using conventional 2.4GHz wifi. Also, when I try to do an AHT via internet recovery, it seems to connect to wifi then (not 100% sure though) but then gives and error code:

"apple.com/support -3403D"

Does anyone know what might be going on here?

 

[Fishrrman]

Can you connect to -other- wifi networks (such as a public one at the library, coffee shop, etc.)?

Might be worth "taking it out" somewhere to check.

Also, have you done any major software upgrades just before the wifi stopped?

 

[Shed209]

Yes I can connect to the local BT Wifi with Fon network (the BT public hotspot network).

 

[Fishrrman]

"Yes I can connect to the local BT Wifi with Fon network (the BT public hotspot network)."

Then it seems to me the problem is probably not so much with the MacBook, but with your modem/router/residential gateway.

Something has changed to cause this.
What was it?

One other thought:
You might try:
1. Go to network pref pane
2. Click advanced
3. Delete current "preferred network" settings for home
4. See if the MacBook can detect your wifi router and re-enter the settings for it.

 

[Shed209]

The fix for the wifi was actually surprisingly straightforward - for once in the history of the world, turning it (the router) off and on actually worked!

However I am still unable to run the AHT, getting the error shown above when I used option+d. Do you know what might be causing that?

 

[CoastalOR]

However I am still unable to run the AHT, getting the error shown above when I used option+d. Do you know what might be causing that?

According to:
https://support.apple.com/en-us/HT201257
Hold just the d key during startup to launch AHT (unless your Mac shipped with Lion or later and you're trying to launch AHT over the internet). The 2010 did not ship with Lion installed.

 

[Shed209]

Just d also did not work. I've read in some places the 2010 can only run the AHT from installation disks. Does anyone know if this is true? If it is, can anyone recommend an alternative diagnostics suite?

 

[CoastalOR]

Just d also did not work. I've read in some places the 2010 can only run the AHT from installation disks. Does anyone know if this is true? If it is, can anyone recommend an alternative diagnostics suite?

The last paragraph of the link I posted probably applies to your situation:
"If you're using OS X Lion v10.7 or earlier and you can't get AHT to start, see if you have an OS X installation disc named “Applications Install Disc 2.” Insert the disc in your internal optical drive or external Apple SuperDrive before following the steps above. Or, if you're using a MacBook Air (Late 2010), plug the MacBook Air Software Reinstall thumb drive into your USB port instead."
Do you not have the installation disks that shipped with your MBP?
If no, then I found this with a internet search for "apple hardware test":
https://github.com/upekkha/AppleHardwareTest