IMac retina - screen random stripes / grain

Hi,
Recently I found an unexpected and weird issue during my work on my iMac, without any reason the screen got lots of grain and diagonal stripes in random way.
It doesn't seem to be an hardware problem, since I got some screenshots (check below) and the disturbs are visible. After a reboot issue didn't happened again but I'm interested to understand what caused it.
My specs are:
Yosemite 10.10.2
iMac Retina 5K 27-inch, Late 2014
3.5 Ghz i5
8 GB
SSD 512GB
AMD Radeon R9 M290X 2048 MB

You have a 1 year warranty, take the machine in for service immediately.

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Thanks Loner T for your response. I don't have any third party NFTS software. At this point I don't think it is worth the effort to attempt to do anything complicated.
I did take some screen grabs and photos as I went through the install for the fourth or fifth time.
1) Disk Utility before start:
2) Create the Windows partition:
3) Initial Windows partitions:
4) Windows message on why can't install
5) Hit the "Format" button, and get this confirmation:
6) Results in partition name getting wiped, and still no active "Next" button:
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Here's the finder window showing the "untitled" volume:
The NTFS partition is there, but the Win 8.1 installer can't use it. Yes, it makes no sense, but that's what is going on!
Here's info from Terminal on CS I see used here if it helps any:
iMac-Retina:~ victor$ diskutil list
/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *121.3 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:          Apple_CoreStorage                         121.0 GB   disk0s2
   3:                 Apple_Boot Boot OS X               134.2 MB   disk0s3
/dev/disk1
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *3.0 TB     disk1
   1:                        EFI EFI                     209.7 MB   disk1s1
   2:          Apple_CoreStorage                         2.8 TB     disk1s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk1s3
   4:       Microsoft Basic Data                         198.9 GB   disk1s4
/dev/disk2
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                  Apple_HFS iMac Retina HD         *2.9 TB     disk2
                                 Logical Volume on disk0s2, disk1s2
                                 5A16E295-8476-4500-A588-7DE44FE207B4
                                 Unencrypted Fusion Drive
iMac-Retina:~ victor$ diskutil cs list
CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group 26BFCEFD-67DB-4AAE-BA18-4CC5EC205697
    =========================================================
    Name:         Macintosh HD
    Status:       Online
    Size:         2921855311872 B (2.9 TB)
    Free Space:   114688 B (114.7 KB)
    |
    +-< Physical Volume 88BDD48F-B9A0-42F9-A05A-26B828B211C9
    |   ----------------------------------------------------
    |   Index:    0
    |   Disk:     disk0s2
    |   Status:   Online
    |   Size:     120988852224 B (121.0 GB)
    |
    +-< Physical Volume BEDB41F3-F2BC-4F31-B08F-A4B3E476A153
    |   ----------------------------------------------------
    |   Index:    1
    |   Disk:     disk1s2
    |   Status:   Online
    |   Size:     2800866459648 B (2.8 TB)
    |
    +-> Logical Volume Family 536F7EC4-2FC3-4878-989E-233DF25AE1E7
        Encryption Status:       Unlocked
        Encryption Type:         None
        Conversion Status:       NoConversion
        Conversion Direction:    -none-
        Has Encrypted Extents:   No
        Fully Secure:            No
        Passphrase Required:     No
        |
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            Disk:                  disk2
            Status:                Online
            Size (Total):          2915999940608 B (2.9 TB)
            Conversion Progress:   -none-
            Revertible:            No
            LV Name:               iMac Retina HD
            Volume Name:           iMac Retina HD
            Content Hint:          Apple_HFS
iMac-Retina:~ victor$
Unless you see a simple solution, it's not worth the hassle at this point for me.
Thanks for your interest.

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Clayton Rhoades wrote:
They've extended their 14 day exchange to 60 days for me while we sort it out.
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The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, or by corruption of certain system caches.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Ask for further instructions.
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Hello discomonkey,
Thanks for visiting Apple Support Communities.
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IMac retina - screen random stripes / grain

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