Blue color lines on display I recently updated to Mavericks OS of my MacBook Pro 13" inch which was bought on October 2012. I am having blue colored lines and strange shapes all over the display. I dont know whether its hardware or software issue. The following images will reveal my issue.
Could be graphics card issue, check my question Macbook pro checkered display, safeboot works 

I ended up replacing the logic board. 

P.S: Talk to customer relations instead of call center and ask for free service in case of hardware failure.