Help! G770 Lenovo laptop won't turn on.

Last night I closed my laptop without turning it off. I do this often and it's been a year now and it works fine until this morning. I opened it and with the battery in I turned it on. The power button didn't turn on, the laptop wouldn't start. I tried removing battery and keeping in the ac plug. Didn't work. I tried putting in the battery and plugging it with the ac plug and it still doesn't work. I notice that when the battery is in, and the ac plug is attached, it shows that the laptop is charging. Removing the battery while the plug is in makes the charging light disappear. So I kept the battery in and the wire as well, and after 15 minutes it started after I pressed the button. Tonight it did the same thing and wouldn't start again. I looked online with m phone and found this site. Someone suggested holding it down for 10 seconds 5 times and plug the ac plug in and it should work, but it did. Any suggestions or solutions. It's finals week, and my exam is tomorrow. Any help before that would be great. Thanks!

hi Jmv,
Welcome to the Lenovo Community.
If you're not hearing any beeping noise comming out from the computer, you could try to:
1. Re-seat the RAM (you can find more info on page 44 on the Hardware Maintenance manual here). If you have 2 RAM modules, you will need to remove one & leave one RAM module in and try turning the computer ON (you're trying to test if one of the RAM chips are defective). Note: You will need to take out the battery and HDD first before you can access the RAM slot.
Caution:
Please be very careful in disassembling your computer as the internal parts are fragile.
If re-seating the RAM module(s) doesn't work, you may need to contact Lenovo Technical Support for service. Lenovo Support Phone List here.
Hope this helps.
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