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Was there a dramatic change in pH at some point?

Ouch dude, I wish i knew how to help you. I hope your plant pulls through! Best of luck!

In fact It has been flowering for around six weeks, its an indoor plant with a 400hps, I have been just giving it water for about 4-5 weeks?? It is looking close? Should i remove all yellow leaves??

nah,,just leave the the leaf's till you chop,,,peace

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When should i chop???

Don't worry about the yellowing, it's normal. The plant should be getting fed with high P nutes. You don't want to feed a flowering plant nitrogen. It will use all the stored nitrogen in the plant which is good as it helps with flavor. Flush the week before you harvest. You should get a magnifying glass and check the tric's, when they are mostly amber it's ready....... Good luck and good grow..

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my hindu skunk is 4 wks into flower and my leaves have begun to yellow. i flushed them and it didnt seem to help so today i gave them a light dose of food and will see what happens. i think w.w. is an 8 week plant. good luck

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wtf?

Ive grown WW before and it is a very sensitive strain when it comes to nutes. I highly doubt they will finish by the 8 week mark its def better to wait until the beginning/middle of the 9th week or even longer to get the full potency.

The 2nd pic is exactly how mine looked. I guarantee it is a Magnesium deficiency. It also seems to be coupled with a phosphate deficiency. Go to wal-mart and buy some epsom salt and add 1/2 teaspoon per gallon of water. Then add some nutes high in P.

Make sure you PH your water after u mix in the nutes/salts. This is CRITICAL step that many people dont do. Get some cheap strips from a pool store. PH should be between 6-6.8. Add a little baking soda to bring the PH up and then retest. If its still too low then add more and test again until its right. If you harvest within the next week or so you will be disappointed with the end product because it could have been so much better. It really packs on density and crystals within the last 3 weeks so wait it out. Good luck!

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looks good towards the end of harvest your plant should start yellowing naturally because it is useing up all its essesential sugars to promote bud growth.