Irulu displays dotted lines?
Such electronic devices from China generally aren't repaired under warranty--to be then returned to customers. Any such repair is not likely at a facility near your home in the US, anyway. If the fabricator or its importer contact here actually refurbishes these, it's likely performed at some single facility--the importer contacts (or perhaps the store--or another store) may then try to sell these again later, for a somewhat lower price, as refurbished units (perhaps not, though).
Once your return your tablet, the refurb process really has nothing to do with you. If you wait past the point of return and refund, the store then won't help you. The importer contact or company might instead send you another refurbished unit, after you ship your tablet--if it's still then technically under warranty.
It's far better to get the store to let you return it to get a refund, or to obtain a replacement--these are the best outcomes if it's defective. (People have trouble with refurbs, sometimes.)
If resetting to factory settings doesn't work, return it to the local store or follow the RMA process (return merchandise authorization) from the online store. If it's defective or broken after all, don't let your rights to return it to get a refund or replacement unit expire: Determine if it's defective in order to get return the process moving soon.
It sounds like a problem which likely may not be easily nor cheaply fixed. It's likely an LCD screen problem--perhaps the tablet was bumped around badly during shipping. (LCD screens really prove quite delicate. This is a larger tablet's LCD screen giving the problem now, after all--it's more likely to be damaged if it's not packed and shipped well.) Read More At : iulu 10.1 inch Andoid 4.0 Touchcreen Tablet PC Support MID......