Light Blue wallpaper always... I cant change it

I am getting this blank blue wallpaper and i dont know how to change it...I try to change it but it wont work, i dont know what to do.
Thanks,

Your profile indicates that your OS is 10.8.1. If that is the case, update to the current level, !0.8.2. Perhaps that may solve the problem.
If that does not work, go in the user LIBRARY>PREFERENCES and trash 'com.apple.desktop.plist'.
Ciao.

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MacBook Pro Repeatedly Loads Purple & Teal Stripe, Gray, Light Blue, Bright Blue and Bright Blue Stripe Screens Instead of OS after Optical Drive Replacement by Apple (PICTURES INCLUDED)

17 inch March 26-29 (order date – shipping date) 2011 MacBook Pro, 256GB Solid State Drive, 2.3 GHz Quad-core Intel Core i7, 1 processer, 4 Cores, 256 KB L2 Cache per core, 8 MB L3 Cache, 8 GB Memory (8GB 1333MHZ DDR3 SDRAM - 2X4GB), AMD Radeon HD 6750M Video Card, Intel HD Graphics 3000 with 512 MB total of VRAM. 110 GBs of free/unused disk space remaining.
Full Specs are in subsequent post.
The issues described in the title continue even after I’ve reinstalled the operating system twice (Snow Leopard) and installed Mavericks (which is working fine and even faster). I’ve tried many commands to repair this.
If anyone has experienced any of the symptoms above or below, your advice and response will be much appreciated as well as marked. These are the details:
My Early 2011 MacBook Pro has had the typical blue screens, screen freezes and graphics issues since I bought it about three years ago but nothing like this and NEVER any load issues until about a month ago. That was when my superdrive replacement was put in.
Since then my MacBook Pro will go into hard freezes or kernel panics. Then I’ll have to power it down manually and power it up manually. It’ll then refuse to load the OS until after multiple tries. It started out just 2 or 3, then 4 or 5, then 6-12, then 20. Now it takes over 30 boots to load the OS. These boot issues also occur even if it doesn’t freeze, i.e.: when I shut it down or restart it naturally (via the Apple menu, etc.).
95% of the time it’ll load to a gray screen instead of the OS. 4% of the time it’ll load to a light blue screen. Then there are the others: the first time this happened it loaded to the striped purple and teal screen shown in the picture. This happened the next four times then intermittently for about 5 or so more times.
It also loaded gray flickering screens. Flickering screens also occurred right before it froze and had to be manually powered down and up. Then it began to load regular gray and light blue screens and all flickering screens stopped. And then bright blue screens a couple times intermittently for a few days, sometimes with lines. Sometimes it’ll load to a blank/black screen as well. I’d reset the NVRAM and SMC but it still continued, happening multiple times a day, each time taking more and more hard shut downs and hard power ons to finally load the OS.
Until I installed Mavericks, every time it finally loaded the OS Finder began indexing. After Mavericks this has occurred 95% of the time.
After talking to Apple Support they had me do a NVRAM and SMC reset again over the phone. The MacBook Pro refused to load the entire time we were on the phone. After the call it got worse. It froze over 6 times that day and at worse took over 30 boots to load the OS.
I finally had time to deal with it the next day when it froze again. After over 25 boots it loaded and I put in the Snow Leopard OS dvd and ran Disk Utility. I verified the hard drive and it said it was fine. Repaired the disk anyway and it gave this message at the end:
“Updating boot support partitions for volume required”.
Next I tried to start in safe mode and it just hung up for hours. Then started up in single mode and it loaded the OS. It then loaded normally for three times in a row. I reinstalled Snow Leopard. Everything loaded normally. I waited an hour or so and then I downloaded Mavericks. 5 or so hours later Mavericks was installed. Everything hardware wise was fine for a day and all software issues were easily fixable incompatibilities. My Mac was even faster with Mavericks. However, Photoshop did give a perhaps relevant message:
“Photoshop has encountered a problem with the display driver, and has temporarily disabled GPU enhancements. Check the video card manufacturer’s website for the latest software.
GPU enhancements can be enabled in the Performance panel of Preferences.”
(I have OpenGL enabled in Photoshop and it was already checked when this error occurred).
Two days ago I went to Disk Utility to repair permissions while logged in to a non-admin account. Verified and repaired the disk, then verified permissions. Everything fine. After repairing permissions however, it gave a weird error box:
"Unapproved caller, SecurityAgent may only be invoked by Apple software".
The box stayed “stuck” in the Disk Utility window. My MacBook Pro then failed to do anything. I manually powered it down and up. It loaded to a gray screen with the error message box again: "Unapproved caller, SecurityAgent may only be invoked by Apple software".
It then refused to load anything else but this message box on a gray screen even after rebooting it multiple times in safe, verbose and single modes and after resetting the NVRAM and SMC. I went online with an iPad and entered in the error and got some advice. I tried to run fsck and erase the /var/folders/ via single user mode but it still loaded to a gray screen with the error message. I just decided to skip to the end and Cmd-R loaded into recovery mode and reinstalled Mavericks again. That worked: the message has not appeared since.
Some people have said this error is related to a hard drive cable failure. I know that this cable was tampered with during the optical drive replacement procedures because I watched them do it.
Everything was fine for a day. Then yesterday my MacBook Pro froze while trying to open a VLC file. It took 12 boots to load the OS. I tried single mode once and verbose mode once. 10 times it loaded to gray screens, even in those mode. A Safe boot lead to a bright blue screen. Finally reset the SMC and it loaded on the 12th time.
Just five hours ago the same thing happened except it took over 30 boots to load the OS. Single, verbose and normal boots, NVRAM and SMC resets lead to gray screens. Safe boots lead to bright blue screens with and without lines (see pictures). Finally loaded on a normal boot.
I know I should have tried safe booting, verbose, single and recovery modes, disk utility, fsck and other command methods earlier this month but in the end, these methods have not solved the problem anymore than resetting the NVRAM or SMC.
There seems to be conclusive evidence that it’s a hardware problem, stemming from last month, the FIRST AND ONLY time my MacBook Pro was opened up. Maybe it’s the hard drive cable, but it could also be the graphics card and/or logic board (something that’s always been defective on this MacBook Pro, in my opinion). Many early 2011 MacBook Pro owners have given evidence to the latter possibility online.
The first time it started it seemed to stem from me using iPhoto and Photoshop a lot. I had both running continuously for about two weeks. This is another reason for suspecting the graphics card/logic board is at fault (in addition to three years of screen/graphics glitches). And since the card is soldered to the board and the board connected to the cable...I also have serious battery draining issues, something else that got bad after the Apple Superdrive repair. And the battery is connected to the board...
Also, since downloading Mavericks, windows from every app get blurry/fuzzy when I scroll or zoom in. I have read that this is happening to a lot of folks though for various reasons.
I guess it could always be the hard drive. I just don’t know. I’m taking it in to Apple, but can't right away because it’s not local. I know they’ll be able to run a test on the hard drive. I wanted to see if anyone else has had this problem (especially the purple and teal striped screen) before they start poking around, possibly creating another problem that goes beyond my Apple Care Plan allotment.

SPECS OF MY MACBOOK PRO:
Model Name: March 26-29 2011 MacBook Pro (order date – shipping date)
Model Identifier: MacBookPro8,3
Processor Name: Quad-core Intel Core i7
Processor Speed:    2.3 GHz
Number of Processors:    1
Total Number of Cores: 4
L2 Cache (per Core): 256 KB
L3 Cache: 8 MB
Memory: 8 GB Memory (8GB 1333MHZ DDR3 SDRAM - 2X4GB)
HARD DRIVE: 256GB Solid State Drive
DISPLAY: MBP 17" HR Antiglare WS Display
AMD Radeon HD 6750M:
Chipset Model: AMD Radeon HD 6750M
Type:    GPU
Bus: PCIe
PCIe Lane Width:    x8
VRAM (Total): 1024 MB
Vendor: ATI (0x1002)
Device ID: 0x6741
Revision ID: 0x0000
ROM Revision: 113-C0170L-573
gMux Version: 1.9.24
EFI Driver Version: 01.00.573
Intel HD Graphics 3000:
Chipset Model: Intel HD Graphics 3000
Type:    GPU
Bus: Built-In
VRAM (Total): 512 MB
Vendor: Intel (0x8086)
Device ID: 0x0126
Revision ID: 0x0009
gMux Version: 1.9.24
Displays
Color LCD:
Resolution: 1920 x 1200
Pixel Depth: 32-Bit Color (ARGB8888)
Main Display: Yes
Mirror: Off
Online: Yes
Built-In: Yes
Battery Information:
Model Information:
Serial Number:    C01111403GLDGKMAE
Manufacturer: DP
Device Name: bq20z451
Pack Lot Code:    0000
PCB Lot Code: 0000
Firmware Version: 0406
Hardware Revision: 0001
Cell Revision:    1102
Charge Information:
Charge Remaining (mAh): 4583
Fully Charged:    No
Charging: Yes
Full Charge Capacity (mAh): 7765
Health Information:
Cycle Count: 276
Condition: Normal
Battery Installed: Yes
Amperage (mA):    -4487
Voltage (mV): 11306
System Power Settings:
AC Power:
System Sleep Timer (Minutes):    15
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes):    15
Wake on AC Change: No
Wake on Clamshell Open: Yes
Wake on LAN: No
Current Power Source: Yes
Display Sleep Uses Dim: No
GPUSwitch: 2
Battery Power:
System Sleep Timer (Minutes):    15
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes):    5
Wake on AC Change: No
Wake on Clamshell Open: Yes
Display Sleep Uses Dim: No
GPUSwitch: 2
Reduce Brightness: Yes
Hardware Configuration:
UPS Installed:    No
AC Charger Information:
Connected: Yes
ID:    0x0100
Wattage (W): 85
Revision: 0x0000
Family: 0x0085
Serial Number:    0x007ad8c5
Charging: Yes
Current operating system: 10.9.3 (Mavericks) ; Installed on 6/21/14
Previous operating system: 10.6.8 (Snow Leopard); Installed 4/4/11
        Reinstalled multiple times. Last reinstall: 6/21/14

Light Blue wallpaper always... I cant change it

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