Try a static discharge this is a common result of not powering down a laptop or computer when working on its hardware. You may also have pooched out your ram
1. Disconnect the power cord
2. Remove the battery
3. Hold down the power button for 30 seconds, then release for 30 sec and then hold down for another 30sec
4. Plug in power; replace battery and power on laptop.
If this causes no Joy try this.
Remove memory and reinstall one stick at a time, if there are more than 1 DIMM of RAM, try each stick in each slot one at a time to see if the memory is ok and to determine if one of the memory slots is bad.
In your case you may want to try completely new memory