My mac is slow, crashes if iPhoto is opened, doesn't boot sometimes

Question

Hello.
In the last time, my MacBook Pro is very slow and crashes sometimes if I open iPhoto or some other programs.
Sometimes, there comes a black display with some thin white lines and then I have to restart the computer.
Also, sometimes the mac doesn't boot right (you see only a grey display after the apple symbole).
I already repaired the system with Disk Utility and erased it to install a backup of my system.
Thank you for your help!
Best regards....
Here is the EtreCheck result:
EtreCheck version: 1.9.15 (52)
Report generated 27. September 2014 17:42:12 MESZ
Hardware Information: ?
  MacBook Pro (15-inch, Late 2011) (Verified)
  MacBook Pro - model: MacBookPro8,2
  1 2.4 GHz Intel Core i7 CPU: 4 cores
  4 GB RAM
Video Information: ?
  Intel HD Graphics 3000 - VRAM: 384 MB
  Color LCD 1680 x 1050
  AMD Radeon HD 6770M - VRAM: 1024 MB
System Software: ?
  OS X 10.9.5 (13F34) - Uptime: 0 days 0:5:31
Disk Information: ?
  APPLE SSD TS128C disk0 : (121,33 GB)
  S.M.A.R.T. Status: Verified
  EFI (disk0s1) <not mounted>: 209,7 MB
  Macintosh HD (disk0s2) / [Startup]: 120,47 GB (14,71 GB free) (Low!)
  Recovery HD (disk0s3) <not mounted>: 650 MB
  MATSHITADVD-R   UJ-8A8 
USB Information: ?
  Apple Inc. FaceTime HD Camera (Built-in)
  Apple Inc. BRCM2070 Hub
  Apple Inc. Bluetooth USB Host Controller
  Apple Inc. Apple Internal Keyboard / Trackpad
  Apple Computer, Inc. IR Receiver
Thunderbolt Information: ?
  Apple Inc. thunderbolt_bus
Gatekeeper: ?
  Mac App Store and identified developers
Kernel Extensions: ?
  [not loaded] com.NovatelWireless.driver.NovatelWirelessUSBCDCECMControl (3.0.15) Support
  [not loaded] com.NovatelWireless.driver.NovatelWirelessUSBCDCECMData (3.0.15) Support
  [not loaded] com.ZTE.driver.ZTEUSBCDCACMData (1.3.8) Support
  [not loaded] com.ZTE.driver.ZTEUSBMassStorageFilter (1.3.8) Support
  [not loaded] com.novatelwireless.driver.3G (3.0.15) Support
  [not loaded] com.novatelwireless.driver.3GData (3.0.15) Support
  [not loaded] com.novatelwireless.driver.DisableAutoInstall (3.0.15) Support
  [not loaded] com.novatelwireless.driver.NWVBE (3.0.15) Support
  [not loaded] com.novatelwireless.kext.wwan (3.0.15) Support
  [not loaded] com.option.driver.OptionHS (3.31.0) Support
  [not loaded] com.option.driver.OptionMSD (1.22.0) Support
  [not loaded] com.sierrawireless.driver.SierraDIPSupport (1.0.0) Support
  [not loaded] com.sierrawireless.driver.SierraDevSupport (1.0.7) Support
  [not loaded] com.sierrawireless.driver.SierraFSRSupport (3.0.0) Support
  [not loaded] com.sierrawireless.driver.SierraHSRSupport (3.0.0) Support
  [not loaded] com.sierrawireless.driver.SierraIPDirect (1.1.3) Support
Startup Items: ?
  ChmodBPF: Path: /Library/StartupItems/ChmodBPF
  HP IO: Path: /Library/StartupItems/HP IO
Launch Daemons: ?
  [loaded] com.adobe.fpsaud.plist Support
  [loaded] com.microsoft.office.licensing.helper.plist Support
  [loaded] com.sierrawireless.SWoCTool.plist Support
User Launch Agents: ?
  [failed] com.adobe.ARM.[...].plist Support
  [failed] com.facebook.videochat.[redacted].plist Support
  [failed] com.google.keystone.agent.plist Support
User Login Items: ?
  MediaCentral Launcher
  ChaxHelperApp
  TheTube Helper
  fuspredownloader
  HP Scheduler
Internet Plug-ins: ?
  Google Earth Web Plug-in: Version: 6.0 Support
  Default Browser: Version: 537 - SDK 10.9
  Flip4Mac WMV Plugin: Version: 3.1.0.24   - SDK 10.8 Support
  Unity Web Player: Version: UnityPlayer version 4.5.1f3 - SDK 10.6 Support
  CouponPrinter-FireFox: Version: Version 1.1.5
  FlashPlayer-10.6: Version: 15.0.0.152 - SDK 10.6 Support
  DivXBrowserPlugin: Version: 1.4 Support
  Flash Player: Version: 15.0.0.152 - SDK 10.6 Support
  QuickTime Plugin: Version: 7.7.3
  iPhotoPhotocast: Version: 7.0
  SharePointBrowserPlugin: Version: 14.2.2 - SDK 10.6 Support
  JavaAppletPlugin: Version: Java 7 Update 45 Check version
Audio Plug-ins: ?
  BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
  AirPlay: Version: 2.0 - SDK 10.9
  AppleAVBAudio: Version: 203.2 - SDK 10.9
  iSightAudio: Version: 7.7.3 - SDK 10.9
iTunes Plug-ins: ?
  Quartz Composer Visualizer: Version: 1.4 - SDK 10.9
3rd Party Preference Panes: ?
  DivX  Support
  Flash Player  Support
  Flip4Mac WMV  Support
  MediaCentral  Support
Time Machine: ?
  Mobile backups: ON
  Auto backup: YES
  Volumes being backed up:
  Macintosh HD: Disk size: 112.20 GB Disk used: 98.50 GB
  Destinations:
  Data [Network] (Last used)
  Total size: 2 TB
  Total number of backups: 24
  Oldest backup: ********
  Last backup: *****
  Size of backup disk: Excellent
  Backup size 2 TB > (Disk size 112.20 GB X 3)
  Time Machine details may not be accurate.
  All volumes being backed up may not be listed.
Top Processes by CPU: ?
      4% WindowServer
      1% fontd
      0% mtmd
      0% Activity Monitor
      0% ps
Top Processes by Memory: ?
  242 MB Safari
  106 MB com.apple.IconServicesAgent
  102 MB mds_stores
  102 MB WindowServer
  82 MB Mail
Virtual Memory Information: ?
  151 MB Free RAM
  1.47 GB Active RAM
  1.34 GB Inactive RAM
  1.04 GB Wired RAM
  554 MB Page-ins
  0 B Page-outs

Answer 1

Make a "Genius" appointment at an Apple Store, or go to another authorized service provider. You may have to leave the machine there for several days.
Back up all data on the internal drive(s) before you hand over your computer to anyone. There are ways to back up a computer that isn't fully functional—ask if you need guidance.
If privacy is a concern, erase the data partition(s) with the option to write zeros* (do this only if you have at least two complete, independent backups, and you know how to restore to an empty drive from any of them.) Don’t erase the recovery partition, if present.
Keeping your confidential data secure during hardware repair
Apple also recommends that you deauthorize a device in the iTunes Store before having it serviced.
*An SSD doesn't need to be zeroed.