http://tplink-forum.pl/domowe-sieci-komputerowe/access-point-soft-ap-mode-przy-pomocy-tp-link-wireless-configuration-utility/ - I have on my forum tutorial and any problem with SoftAP configuration....

Maybe you have previously configured ad-hoc in system?

When you have DHCP-disabled you have to connect without WAN port. Mikrotik->LAN port in TP-link.

You don't have right. Problem isn't simple. We have too much TV brands and too much different video protocols. I know DLNA on Gargoyle but isn't perfect too.

I think, that this is problem with power supply. Your hard drive needs more power than the power supply gives.

Problem with DLNA server isn't only TP-link side. This protocol is not standard in all TV brands.