Well...
Start with removing your battery and assuring your contacts are spiffy-clean! A NEW pencil eraser should do a good job but don't rub so hard you remove the thin chrome plating. Carefully clean the contacts that mate with your battery inside your system too. Shake out any rubber remains,
Now give your X775 a really GOOD charge, If you have the same results it's time to look elsewhere. It may be a faulty power supply?
When possible OPEN your DVD drive. With your battery removed (and drive bay door open) ~ use a air compressor (ala gas station) or air can and blow all of the dust out! DO NOT invert the can as it will deliver LOTS of MOISTURE into your laptop ~ NOT good.
IS your CPU fan is working?... Remove ALL of the dust from your CPU fan AND dust on your cooling fins under the fan too! Dust can cause your CPU to heat pronto. It can also BAKE the silicone seal under the cooling fins... also not good!
Check YOUTUBE to see how to remove your hard drive... honestly, it looks like a very easy job.
Just be CAREFUL with the ribbon cable and connector! Will your computer start with the hard drive removed? Shutdown and restart several times... still OK? If so suspect your drive.
With your hard drive out, can boot from a CD/DVD? If so, suspect that hard drive again.
You are in luck because your X775 will support 2 drives! IF a new drive is required install one. Leave your original hard drive out. Once you have your new drive working and all drivers in, shut your system down and install your ORIGINAL drive as a slave or drive 2. YOU MAY still be able to harvest your data from drive 2 to your new hard drive!
IF some of your drivers were missing after your new drive install, you MAY be able to harvest some of the drivers from drive 2 (your original)? Good luck!
Anthony
I encourage you to see YOUTUBE for very good details on your hard drive... IF you go to a pro to do the job BE SURE to have him/her to replace the CMOS Battery too!
How to Add second HDD to your qosmio x770
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