HELP! MacBook Pro 17" Won't Boot-Grey Screen-Errors During Verbose Safe Mode Boot

Booting regularly it hangs on the grey screen, if it does go into desktop, it freezes and won't do anything.
I did disk check and repair even though it found no errors, and did verify and fix permissions since it showed a LOT of permission errors. Still won't boot into desktop though.
Ran safe mode verbose and got the following disk0s2 I/O Errors-What does this mean??? Hard drive problem?
I have reload OS X 3 times in the past few weeks because of freezing issues in Mavericks and stuck with Mountain Lion and it was running fine until I went to boot up this morning after a clean shut down and won't boot up ever since.
http://i43.photobucket.com/albums/e389/RIPNHL2005/photo_zpsb0d8d5cf.jpg
http://s43.photobucket.com/user/RIPNHL2005/media/photo_zpsb0d8d5cf.jpg.html
Please help.....This is my main laptop and job search tool.....
Thanks!!!

Is this the right drive config for the macbook pro?
Is Western Digital no good? Best Buy has them in stock.....
HGST
500GB Travelstar™ Z5K500 Hard Disk Drive
2.5-Inch | SATA 3.0Gb/s | 5400RPM | 8MB Cache
High-performance, high-capacity mobile storage for notebook PCs and other applications
Low Profile - 7mm thickness for slim designs
High Capacity - Up to 500GB
Quiet Operation - Enjoy a richer audio-listening experience
Travelstar Z5K500 is the second generation 7mm, 5400 RPM 2.5-inch hard drive from HGST, with capacities ranging from 250GB to 500GB, and the second generation Advanced Format drive. Advanced Format increases the physical sector size on HDDs from 512 bytes to 4,096 (4K) bytes, which improves drive capacities and error correction capabilities. The 500GB per platter, one-disk models are designed as a direct replacement for standard 9.5mm HDDs, for use in notebook PCs, external storage and gaming consoles, as well as new, thinner and more robust device designs. The Z5K500 carries the EcoTrac classification due to its low-power consumption and eco-friendly, halogen-free production. Travelstar Z5K500 delivers the right balance of capacity, power-management and design flexibility to meet the needs of mobile applications.

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Update:
So, I managed to do ALL that you said, EXCEPT, the reboot and work fine business.
I created the admin account which works fine. So now I can see three user accounts (looks like there as already an admin type one).
The one I created works fine, only, I can only access/see the login screen through a safe boot, (otherwise blue screens...) . I can get into the admin account fine, but when restarting and logging in as my original user account it won't boot. Something is very wrong in MY user account. I think at this point my data there is still retrievable somehow for a backup, clean start. but i haven't reached that point yet.
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remember from my first post system profiler says software/extensions integrity 'kext has no receipt' and dependency errors: 'com.apple.iokit.IOUSBFamily and com.apple.kernel.iokit; no valid version found' - whereas in my newly created admin account it appears AOK.
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sorry lots of queries here but i am ever hopeful.....
All yours,
Charlie
G3 iBook 800mhz Mac OS X (10.4.6)

HELP! MacBook Pro 17" Won't Boot-Grey Screen-Errors During Verbose Safe Mode Boot

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