I bought a MacBook Air in January 2011. This computer has caused me a lot of trouble, just to name a few: - Disconnects bluetooth for no apparent reason - I have to manually connect the mouse after every re-start - Disconnects from the internet for no apparent reason - The wireless key board and integral keyboard stop working for 2 minutes or so and then works again - Unable to re-start or shut down the computer, the only way to do this is a hard shut-down - It does not recognise my HP Laserjet on the wireless network - my other PC's do. - The font size is extremely small - The staff at the Apple shop could not help me. - It has slowed down dramatically over the past 6 months - At times the battery does not charge beyond 90% - It does not recognise my Vodafone wireless dongle - It takes a long time to start up; about the same as a Windows XP PC. - The fan comes on very loud despite this computer having a SSD - MS Office for Mac is very temperamental - it shuts down or freezes completely Does anyone else have these problems ? Seems that most of my problems occurred after I upgraded the IOS. Monday 1 Oct: Iphoto refuses to import pictures from a SD card. This worked fine last week; After 2 re-starts, my Wallpaper has changed as decided by my MacBook Air (I like surprises, but this goes a little far). My trackpad did not connect, requiring a manual re-connect. This computer is testing me to the limit ... I have forgotten what is so good about these Apple machines ... but would I ever buy another one? Absolutely not. 4 Oct: Prior to perform a clean install as suggested on the various replies, I backed up my MBA on an external LaCie drive 3 days ago, which seemed to go ok until tonight when I re-connected my LaCie drive and my MBA displayed the message that the files on the hard drive could not be repaired by the OS. The external drives needs to be re-formatted. Another surprise and challenge .... 12 Nov: My MacBook Air informed me that there was an IOS update available and required a re-start. Naturally, as you would expect things to be better after an update, I agreed to install, re-start etc etc. However, now I need to re-type all of my software application product keys ! So if you do this upgrade while away from where you keep the official software (most probably in a secure place), your Mac becomes really useless ! Again, extremely disappointing performance from Apple ... this does not happen when you have a IOS upgrade with a Windows PC. The other really disappointing issue is that Apple actually does not inform you prior to the upgrade that you need the software product keys to keep using your computer. All in all, extremely disappointing ... it is all very gimmicky and unprofessional. On a side note, the upgrade has not improved performance at all... as a matter of fact, my 6 year old Dell XPS outperforms my state of the art (not) Macbook Air.