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when the screen is black and the power light is steadly lit, shine a flash light at the screen. if you can see something, the inverter board is bad and the back light cannot turn on. if the power light flickers, reseat the power plug and put your ear to the back of the monitor where the power plug is. if you hear a buzzing or any high pitched noises; the power supply is bad. use the macufactures warranty for repairs.
Most Mac laptop power supplies are 120 and 240 volt compatible, useable from 108 to 122V or so or double that but not between. All you should need is a plug converter. So unless it specifically says 120VAC on the brick, you should be good to go. If you have lost your manual, try looking up your model (not mentioned) on the Apple web site. You can also try the discussion boards for your model. The 1600W converter/triac(?) is for heaters like hair dryers--it produces a lot of electrical noise. The typical 50W converter/transformer is underpowered for most Macs, which need 60 to 100W.
Hi, I have the same problem with chemical sensitivty as you and the same problem with my new laptop. My new Toshiba U500 emits a smell that makes my mouth and throat burn and I think it's either the Intel Core 2 Duo processor chip (most likely I think) or possibly some sealant in the heat sink below it. I have had the same problem with some Dell T3400 desktops at work that happen to have the exact same 2.66 GHz Intel Core 2 Duo chip. I've had no trouble with new HP XW8600 desktops (Intel Xeon chips) and no trouble with my old Toshiba Satellite 2450 (Intel Pentium 4 chip) notebook when it was new.
I will see what Toshiba say and an independant IT person. Maybe I'll try another chip ?
Check out this thread: http://www.mac-forums.com/forums/apple-desktops/61705-mac-pro-has-odor-problem.html
If anyone has any sensible explanations I'm all ears. Sorry Damien.