Sounds like a memory problem, First... Unplug your power adapter then remove your battery, and memory modules. Press your start button for 10 seconds then plug in power adapter and memory modules " don't install battery and make sure the memory modules are seated correctly". Then try to start the laptop. If it still shuts down, and you have more then one, check your memory modules by taking one out at a time and try to start. Otherwise... If it still doesn't start, try a known working memory module.