Thank you for your response!
I forgot to mention this in the first post but after the clean install I still had my Safari bookmarks, and a couple of days of browser history, did I not do it right?)
But here is what happened when trying your advice:
Booted up in safe mode - macbook was really slow, the screen what kind of half white when booting up, like the screen couldn't keep up... I couldn't stream netflix, and youtube was running very slowly.
I booted up normally and the macbook ran netflix for 20-30 min before shutting down (that's the longest it's gone for a long time)
Verified disk permissions and got SUID file was modified but not repaired, apparently that is normal?? - didn't help
Reset NVRAM - didn't help
Reset SMC - didn't help :-(
Ran the test, and here is the result
Problem description:
If the power cord is not attached, Macbook pro shuts down when streaming video, netflix, youtube etc.
EtreCheck version: 2.4.1 (137)
Report generated 8/27/15, 6:43 PM
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Click the [Click for details] links for more information about that line.
Hardware Information: (What does this mean?)
MacBook Pro (13-inch, Mid 2010) (Technical Specifications)
MacBook Pro - model: MacBookPro7,1
1 2.4 GHz Intel Core 2 Duo CPU: 2-core
4 GB RAM Upgradeable
BANK 0/DIMM0
2 GB DDR3 1067 MHz ok
BANK 1/DIMM0
2 GB DDR3 1067 MHz ok
Bluetooth: Old - Handoff/Airdrop2 not supported
Wireless: en1: 802.11 a/b/g/n
Battery: Health = Normal - Cycle count = 1260 - SN = W00030C0L77ZC
Video Information: (What does this mean?)
NVIDIA GeForce 320M - VRAM: 256 MB
Color LCD 1280 x 800
System Software: (What does this mean?)
OS X 10.10.5 (14F27) - Time since boot: less than an hour
Disk Information: (What does this mean?)
Hitachi HTS545025B9SA02 disk0 : (250,06 GB) (Rotational)
EFI (disk0s1) <not mounted> : 210 MB
Macintosh HD (disk0s2) / : 249.20 GB (229.79 GB free)
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
HL-DT-ST DVDRW GS23N ()
USB Information: (What does this mean?)
Apple Inc. Built-in iSight
Apple Internal Memory Card Reader
Apple Inc. BRCM2046 Hub
Apple Inc. Bluetooth USB Host Controller
Apple Computer, Inc. IR Receiver
Apple Inc. Apple Internal Keyboard / Trackpad
Configuration files: (What does this mean?)
/etc/sudoers - Modified
Gatekeeper: (What does this mean?)
Mac App Store and identified developers
User Login Items: (What does this mean?)
iTunesHelper Application (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
Internet Plug-ins: (What does this mean?)
Default Browser: Version: 600 - SDK 10.10
QuickTime Plugin: Version: 7.7.3
Silverlight: Version: 5.1.40728.0 - SDK 10.6 [Click for support]
3rd Party Preference Panes: (What does this mean?)
None
Time Machine: (What does this mean?)
Time Machine not configured!
Top Processes by CPU: (What does this mean?)
10% WindowServer
7% mdwrite
2% mds_stores
1% mdworker32
0% mds
Top Processes by Memory: (What does this mean?)
326 MB kernel_task
266 MB mdworker(6)
172 MB com.apple.WebKit.WebContent(3)
160 MB mds_stores
123 MB Mail
Virtual Memory Information: (What does this mean?)
20 MB Free RAM
3.98 GB Used RAM (651 MB Cached)
1 MB Swap Used
Diagnostics Information: (What does this mean?)
Aug 27, 2015, 06:34:09 PM Self test - passed
Aug 27, 2015, 03:01:22 PM ~/Library/Logs/DiagnosticReports/fontd_2015-08-27-150122_[redacted].crash
Aug 26, 2015, 10:44:09 PM ~/Library/Logs/DiagnosticReports/com.apple.photomoments_2015-08-26-224409_[reda cted].crash