X220 won't boot sometime

Hi
I am facing a very weired problem with my lenovo x220. I have been using this laptop for few years and never faced any issues with my x220. But from last few weeks i am facing a problem that cannot be ractiifed. I have changed my laptop screen as it was shattered few weeks ago. Since that i have problem to power on my laptop. I have remove the battery and hold the power button 30 second  to reset the battery. Sometime it works and sometime it doesn't. I have changed the CMOS battery as it was identified as dead. After replacing the old CMOS battery with a new one i am still facing the same problem. Sometime the laptop did power on after removing the battery and hold the power on button for 30 seconds and put the battery back to power up but it is doesnt work all the time. Sometime i have to try few hours by removing the battery and hold the power button for 30 seconds. Once it power on it works fine and even if i shutdown the laptop it still manages to power on normally straight after but if the laptop didnt turned on for few hours it goes back to that stupid mode of not powering up. Can someone please help me/advice me regarding to this issues. Thank you in advnace. 
Moderator comment: Please don't post the same message(s) in multiple places as it splinters the discussion. Duplicate(s) removed.

Thanks for the suggestions, I managed to find out what was wrong:
There is a boot exclusion list in BIOS that I was not aware of, and USB flash drive was on here by default on my machine for some reason. If anybody else have USB boot issues, this is how I got it working:
With a bootable USB Flash Drive plugged in, go into BIOS settings, Startup, select the >Boot header and press enter so you get the boot device order list. Scroll down past the last entry in this list, and you will jump to a boot exclusion list. Find your USB flash drive here and type "!" to get it off the exclusion list and on to the boot device order list. Save BIOS changes. Now it will also show on F12 at boot, and boot.

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    Sometimes they do work - i've done it before.  I have a late 2008 Macbook Uni and used the install dvd of my 2009 Macbook White and it worked.
    Why not just clone your hard drive?  It'll save you a lot of time doing a clone rather than doing a clean install.
    Unless you're having issues with your old set up or  your old hard drive is dead.
    You can download Carbon Copy Cloner - install your new hard drive in a external usb enclosure (around $10) and clone fromt here then test it before you install it in your Macbook.
    Once you've done the swap, you can install your old hard drive in the USB enclosure and use it as a backup drive.
    Good luck

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