If it's out of warranty and has serious problems it'll likely cost much more to repair than to simply replace. Unless you can salvage the parts you need from another dead/dying G53 and do your own labour on the cheap *and* fix the thing up well enough that you'll be confident something else won't die a few months down the road.
A newer laptop would be smarter. And, sorry to say, 20fps in Splinter Cell (at 1366x768) is pretty sad compared to any gaming desktop these days. $1000 would easily get you a mid-end gaming rig with an R9-390 or GTX970 capable of 30-60fps at 1920x1080,
this site is a fine at-a-glance reference.
Gaming laptops are indeed Oh-So-Great ... when compared vs
other laptops. But even the best of the best of the most elite gaming laptops are sorely outclassed by a desktop built for the same price. No computer lasts forever, but laptops can't be upgraded so they get obsolete much faster than desktops (let alone the fact that they break easier and no laptop battery will last more than 2-3 years at most), so laptop hardware repair/upgrade options are limited and costly and often become unavailable by the time you need them. At least an aging desktop can be infused with a few more years each time you yank out some elderly part and plug in something new.
"All opinions are not equal. Some are a very great deal more robust, sophisticated and well supported in logic and argument than others." - Douglas Adams
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