Laptop LED does not turn on after sleep or at startup

Registration date
Monday August 8, 2016
Last seen
August 8, 2016
I am facing a problem with my Laptop LED display. Whenever I turn on my laptop the led screen shows nothing while windows load because I can hear startup sound of it. Then I force shutdown my laptop and turn it back on and led works normally. It only gives me a problem when I put my PC to sleep or when I turn it on. Specifications of my laptop are:
• Lenovo G510
• 1 TB hard drive
• 2GB AMD Radeon Graphics card.
• 2.50 Ghz Processor

I applied some solution but it didn't work

• Press the power button for 10s after taking out the battery.
• Cleaned Ram.
• Serviced my Laptop.

Is this a hardware problem ? What should I do ?

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