If it work before the reset (even being rooted), then stop working after - there might be a different problem other than the rooting. I move your thread over to the LG Marquee (ATR) support forum hopefully to some help from other users of the same device.

 

Have you tried going to settings>applications>manage applications: select all at the top. Then search for download manager open and clear data then force stop also do the same for google framework services and google play store. When you open google play store it should act as if it is the first time you have and test that...

 

Anyone getting Server Error when opening Play Store. I have v3.5.19

Edit: nvm, it fixed on its own

 

server issue has nothing to do with root other phones was also affected so i am thinking that google play was having some issue of its own its fine now

 

It was a known issue that Google even posted on their blog. They fixed the issue and released a newer version of the market. These issues may persist after a new rom flash until the play store auto updates itself.

 

Google Play is having quite a few issues these days. A trip to their site will usually help out with a quick fix to most of the problems people are having today. That fix usually involves wiping data and cache.