Indoor Gardening and Houseplants: help with new dracaena -, 1 by capt_insano

capt_insano wrote:
I have several dracaena through out the house and all have done well with the exception of the newest guy. I bought this Dragon Tree at Home Depot three weeks ago - and since then, the base of the leaves have started to yellow and the leaves drop off. Some of the tips were already scorched - but it didn't have this problem when I bought it.

What is it? Not enough light? To much water? I haven't found any webs, but could it be spider mites?
Attached are some pics. Thanks for your help -

Whole Plant: