So I think my WiFi card is going bad, something funky is going on with my RAM changing sizes from 4GB to 2.78GB, Windows Vista/7 32bit/64bit hard freezes randomly and application crashes in OSX. Naturally, I went to run the Apple Hardware Test to diagnose the problem as it seems to possibly be hardware related. It doesn't work. 1st try: Laptop On, restarted holding D key, booted to OSX. 2nd try: Laptop Off, Turned on holding D key, booted to OSX. 3rd try: Laptop Off, reset SMC, PRAM, Restart and held D key, booted to OSX. 4th try: Laptop On, Inserted Snow Leopard Upgrade Disk, restarted holding D key, booted to OSX. 5th try: Laptop On, Inserted the original 15-inch MacBook Pro Mac OS X Install DVD, restarted holding D key, booted to OSX 6th try: Called Apple, they told me to do the same thing as I have been trying... booted to OSX in the end. 7th try: Removed Hard Drive, turned on laptop holding D key, flashing folder came up 8th try: Hard Drive still removed, inserted the original 15-inch MacBook Pro Mac OS X Install DVD, turned on holding D key, booted to setup. I'm out of ideas... Is there something I'm doing completely wrong or something? From what I understand, the AHT is located on the hard drive, and on the disk, and you boot to it by holding down the D key. I should only have to use the disk if the hard drive is toast, which it is not. Specs of laptop in signature. Thanks.