Computer Won't Boot Up

Here is my issue, my computer one day was working fine and the next it won't boot properly.
System Specs: Satellite T235D-S1345RD (Laptop) - Windows 7 (64bit) - BIOS 1.7 - 4gb RAM -
I have gotten the computer booted one time. I am unsure why it did that time but did not do it another time. 
Since that one time I put the computer in hibernate and when I tried to bring it out it told me it failed when coming out of hibernate so it went to reboot and now won't boot.
Here are the few steps I have done to try and get it working.  When it boots up it gives me an error message (says that power failed or for some reason it did not boot)
I have ran "Repair Computer" and it does not do anything.  I try start windows normally and it goes no where.
So I then tried F8 and got into the Advanced Boot Menu. First one I tried was Start Windows From Last Known Good Configuration. (or something like that I forget the exact wording)
When it does that the computer will start to boot up go to the "Windows Loading" screen and then it flashes a blue screen (there are words there but it flashes so quickly I cannot read it) and it goes back to the boot screen and acts like it is restarting and continues in that loop.
Next step - Enter F8 again tried "Repair Computer" and it loads to a black screen with a Cursor but nothing ever happens. I have given it over 30 min and nothing happens.
So next step- I enter F8 again and try to boot up in safe mode and again when it loads it flashes a blue screen and then nothing.
EDIT - I found how to show the blue screen. It says UNMOUNTABLE_BOOT_VOLUME. Not sure what else I should do after I get that error message. Message Reads:
It reads UNMOUNTABLE_BOOT_VOLUME and says if it's the first time I've seen the error screen, to restart the computer. Then it tells me if it appears again, to check and make sure any new hardware or software is properly installed.
"If problems continue, disable or remove any newly installed hardware or software. Disable BIOS memory options such as caching or shadowing. If you need to use Safe Mode to remove or disable components, restart your computer, press F8 to select Advanced Startup Options, and then select Safe Mode."
END EDIT
Next Step: I come to you guys here on this forum. I am a bit perplexed and lost at what to do. I wonder if this is a virus but I cannot get the computer to respond to try to get  into it to check.
Ideas? Advice? What should I try? I can get into the F8 menu but not sure what else I should try. I will try anything to get this computer up and running!
Thanks for any and all help.
Lynda

Hi:
The 24 character failure ID usually indicates HDD is failing/has failed. You need to replace it with a new one.
Specs: http://support.hp.com/in-en/product/HP-Pavilion-dv6-Entertainment-Notebook-PC-series/5191856/model/5...
Manual: http://h10032.www1.hp.com/ctg/Manual/c03099531
Check warranty: http://h10025.www1.hp.com/ewfrf/wc/weInput?cc=us&lc=en
Order recovery USB: http://support.hp.com/in-en/product/HP-Pavilion-dv6-6c13cl-Entertainment-Notebook-PC/5191856/model/5...
Contact HP: https://support.hp.com/in-en/contact-hp/product/HP-Pavilion-dv6-6c00-Entertainment-Notebook-PC-serie...
If you're under warranty, HP would send you replacement HDD.
If you're not, buy any branded 2.5" SATA 9.5mm thick internal laptop HDD and replace it yourself. But HDD of at least same capacity HDD as the one that came with your laptop (640gb) so that recovery media would work -
Go through page 56-58 in the Manual for replacement procedure. It's quite simple DIY job.
Something like this:
http://m.newegg.com/Product/index?itemnumber=N82E16822236561
If you've not yet created the Recovery media to restore the factory settings after replacement, you have to order a set of Recovery USB from HP.
For salvaging the data from old HDD, I suggest you take out the drive. Connect it to another PC using SATA to USB adapter - copy all the files you need.
http://www.amazon.com/Anker®-Converter-Adapter-Cable-included/dp/B005B3VO24
Regards
Visruth
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**I'm a Volunteer, I do not work for HP**

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