Power light keeps flashing when in sleep mode

hi

try to isolate using external monitor,
check connection of lcd cable
replaced lcd panel

possible cpu failure, power button will light and flash indicating that there is a problem.
battery light will be orange due to charging mode.

A laptop computer is typically set to conserve battery power. One of the common settings called standby, sleep mode or hibernation turns off power to the screen and the laptop itself after a preset time limit passes without any mouse or keyboard activity. It can be inconvenient for the computer to shut down while you're working on an open page or during a download. Change the setting if you don't want your laptop to going into automatic shutdowns

Turn the laptop computer on with the power button if it's not set to turn on upon opening. Allow the system to boot up. Open the panel for adjusting the sleep settings. This varies among the popular versions of Windows operating systems. To change the sleep mode setting on a laptop running Windows XP, click the "Start" button, and click the "Control Panel" selection. Choose the "Performance and Maintenance" selection, and click on "Power Options." Click the "Power Schemes" tab, and click the drop downs next to "Turn Off Monitor," "Turn Off Hard Disk," "System Standby" and "System Hibernates." Select "Never" for each drop down in both the "Plugged in" and "Running on Battery Power" columns. Click the "Hibernate" tab and click to remove the check mark in the box next to "Enable Hibernation." To change the sleep settings on a Windows Vista laptop, click "Start," "Control Panel," "Systems and Maintenance" and "Power Options." Then click "Change Plan Settings" under the currently established plan. Click on the "Advanced Settings" tab and select the "Never" option on the "Sleep," "Sleep After," "Hibernate After," "Display" and "Turn off Display After" drop downs. Click the "OK" and "Save Changes" buttons to confirm the settings. To change the sleep settings on a laptop running Windows 7, click the "Start" button, choose "All Control Panel Items," select "Power Options" and click "Edit Plan Settings." Click the drop downs for "Turn off the Display" and "Put the Computer to Sleep." Choose "Never" for both and click the "Save Changes" button.

Bring it to a repair shop and have them check it out. They should at the very least be able to recover you data.

If it is in sleep pressing any key or moving the mouse will generally wake it up. If you left the computer unplugged in sleep mode then it most likely ran out of power. If your using hibernate I would recommend not using it as it has so many issues.... :) If you have to hit the power button to wake it up then it's either shutdown or in hibernate. FYI there will generally be an amber light on to indicate sleep mode. If no lights it's most likely not in sleep mode.
Comment if you need additional assistance.

Could be a battery, power adapter or power receptacle problem.
Please refer to the following 2 articles to diagnose & fix the problem:
http://www.fixya.com/support/r6416948-troubleshooting_laptop_power_failures
and,
http://www.fixya.com/support/r6395191-troubleshooting_laptop_power_failures_ac

my laptop get overheating for cooling what required..... please tell me............????????

It might be going into sleep mode or hibernate mode.

plug out the batter and give the AC. turn it up. any light? if you dont have you have a problem with Mainboard that doesnt let the electircitiy goes in.

of course i am assuming your adapter is working :)