Three white hats Mk 2?

Question

Sorry guys, missed out an important part of this the first time round, which is why nobody's head was hurting and everybody thought they had it.

Three men are blindfolded, and each has a hat placed on his head. They are led into a room, where they are told that they are all wearing either a black or white hat, and that they must raise their hands when they can see a white hat, and drop their hands when they know what colour their own hat is. The blindfolds are removed, and they all put up their hands. After a couple of minutes, one man drops his hand and says "My hat is white." How did he know?

FAQs
No, there are no mirrors.
No, he didn't ask one of the others.
No, he can't see his own hat.

They only have to see one white hat to raise their hands... If he was wearing a black hat, each of the others would still see a white hat on the third man.

And he has his hand up, so he must be seeing at least one white hat.

...And he sees two white hats in front of him.

Answer 1

If there were at least two black hats then someone would not raise their hand.
If there was one black hat then the person wearing it could figure out that one white hatted person could see three hands (and his black hat) and that this white hatted person must be able to figure out that his own hat must be white.
Since no one had figured this out then all three must be wearing white hats.
(This, of course, assumes that there is an incentive to answer and to answer correctly. It also assumes they all have reasonable intelligence and eyesight)

Answer 2

If there were two black hats then someone would not raise their hand.
If there was one black hat then the person wearing it could figure out that one white hatted person could see three hands (and his black hat) and figure out that his own hat must be white.
Since no one had figured this out then all three must be wearing white hats.

Answer 3

Tho others had their two hands up so he knew they could both see two white hats and as his was one of what they could see it must be white.
any of them could have figured it out

Answer 4

all their hands were raised so he knew they both saw a white hat; hence; his is white.

Answer 5

This is just too much hard work - sorry !

Answer 6

Okay.!!!