good clothes at cheap rate, that being under Rs. 1000? ---
Majestic {nearest}
cheap casual clothes? ?(plain tshirts/shirts) --
Majestic
computer hardware at cheapest price in bglore? --
SP Road {no better place
}
factory outlets of nike, reebok, puma etc. ---
Marathalli...{yelahanka too has some I guess, not very sure}
PROPER north food. cheap, if possible. ---
depends on what you mean by PROPER. North Indian food is available everywhere but if by PROPER you mean food made by your mum, then ghar se ek-do dibba saath le aana. lol
North chaat, anywhere? --
everywhere.
Service centre of Dell.--
NO idea.
Few shops like Alfa in Mumbai, where i can get stuff without bills --
dunno what you get over at Alfa. So can't suggest.