Without the proper tools to test it, you'll likely end up chasing ghosts IMO and may never know for sure what the issue is. Without the proper tools to fix it you could make it even worse. If you have access to the tools you need then cool, but if not I'd see if there's a hardware shop around you (assuming it is not under warranty of course). If not, I found a site years ago called laptoprescue.com and it was pretty reasonable at the time; free shipping, flat rate for diagnosis, and no extra charge to get it sent back if you decline repairs. Things may have changed, but that is how it was a few years abck and they had great service too.