The Aspire 4730 contains a 14" HD display ideal for carefree multimedia enjoyment and communication on the go. It also boasts an Intel Pentium Dual-Core Processor, Mobile Intel GL40 Express, 14.1" WXGA (1280 x 800) TFT LCD with Acer CrystalBrite Technology, and Integrated Intel Graphics Media Accelerator 4500M.
It might be an overheating issue, to diagnose you can download a program called HWmonitor and keep an eye on your temps, if they exceed 90 degrees you may have an issue.