Acer Aspire R3 Model N15WS

I have this Acer Aspire R3 model and suddenly from two days when i keep laptop on sleep mode it does not come back on. It keeps on blinking orange light near to power button. Please help as what should i do? I have tried holding power button but no effect. When i connect charger it shows bettery is charging. Sometime it just comes on. But really frustrated as what can be wrong??
Your help is highly appricated.
Thanks
Svkenya