U310 Windows 7 boot issue - black screen

Hi 
my u310 w7 500Go i3 I bought less than two months ago got problems since some time already for booting. Nothing happens except Caps light blink on the keyboard + power and battery lights. Only black screen (no bios, lenovo message whatever)
Until now I was able to get it back 3 times after 'trying' a number of times (30 ?) pressing the power button on/off or just waiting. One time I just waited for 1 hour and it was booting on the first press of power button. This time I am about to give up.
I have tried to press F2, F8, F10,F12 just after poweron (not sure if i have to use function key or not at that time, i set it back in bios to'normal' mode with Fn)
I tried with power cable plugged/unpluged.
I tried connecting an external DVD drive with W7 recovery disk. I tried to press recovery button. Nothing happens. (DVD drive lights up)
help would be much appreciated!
thanks
hervey

Hi
Welcome To Lenovo Community
We are really sorry to hear about the issue you are facing,  
Please try disconnecting all cable and battery from the unit , Now press the power button for 30-40 sec then release , perform this action 4 -5 times , now connect AC adaptor  to check  by powering on and booting the system. If system is working fine you can shut down and connect the battery to check
Do give this a try and let us know  
Hope This Helps
Cheers!!!
WW Social Media
Important Note: If you need help, post your question in the forum, and include your system type, model number and OS. Do not post your serial number.
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