[FONT=verdana]Operating system means Windows or Linux or other. [/FONT]
[FONT=verdana]If Windows what version? 98, XP, Vista or Win 7 ? [/FONT]
[FONT=verdana]Do you have the operating system's disk? [/FONT]
[FONT=verdana]If you are running Windows XP try to go in safe mode tapping F8 while booting. If you can do that, we are on the way to recovery.[/FONT]
[LEFT][FONT=helvetica]Try check the RAM first.
If there is more than 1 RAM on the PC, please use 1 at a time.[/FONT][/LEFT]
[LEFT][FONT=helvetica]also discharge and reset the mainboard by doing the following:[/FONT][/LEFT]
[LEFT][FONT=helvetica]Unplug the AC adapter and remove battery, pressing the power button over 15 seconds do not let go.
Then connect the AC adapter only and power on the laptop.[/FONT][/LEFT]