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I tried looking online for help but specifically I don't know what the problem is, I also edited my profile under the JVM arguments by changing "-Xmx1g-" to "-Xmx2G" but it still didn't help. Here's my crash report:

---- Minecraft Crash Report ----
// Surprise! Haha. Well, this is awkward.

Time: 10/28/16 6:12 PM
Description: Initializing game

org.lwjgl.LWJGLException: Could not create pixel format
at org.lwjgl.opengl.MacOSXPeerInfo.nChoosePixelFormat(Native Method)
at org.lwjgl.opengl.MacOSXPeerInfo.choosePixelFormat(MacOSXPeerInfo.java:58)
at org.lwjgl.opengl.MacOSXPeerInfo.<init>(MacOSXPeerInfo.java:53)
at org.lwjgl.opengl.MacOSXCanvasPeerInfo.<init>(MacOSXCanvasPeerInfo.java:61)
at org.lwjgl.opengl.MacOSXDisplayPeerInfo.<init>(MacOSXDisplayPeerInfo.java:48)
at org.lwjgl.opengl.MacOSXDisplay.createPeerInfo(MacOSXDisplay.java:323)
at org.lwjgl.opengl.DrawableGL.setPixelFormat(DrawableGL.java:61)
at org.lwjgl.opengl.Display.create(Display.java:846)
at org.lwjgl.opengl.Display.create(Display.java:757)
at org.lwjgl.opengl.Display.create(Display.java:739)
at bcx.ap(SourceFile:598)
at bcx.an(SourceFile:434)
at bcx.a(SourceFile:381)
at net.minecraft.client.main.Main.main(SourceFile:124)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Thread: Client thread
Stacktrace:
at org.lwjgl.opengl.MacOSXPeerInfo.nChoosePixelFormat(Native Method)
at org.lwjgl.opengl.MacOSXPeerInfo.choosePixelFormat(MacOSXPeerInfo.java:58)
at org.lwjgl.opengl.MacOSXPeerInfo.<init>(MacOSXPeerInfo.java:53)
at org.lwjgl.opengl.MacOSXCanvasPeerInfo.<init>(MacOSXCanvasPeerInfo.java:61)
at org.lwjgl.opengl.MacOSXDisplayPeerInfo.<init>(MacOSXDisplayPeerInfo.java:48)
at org.lwjgl.opengl.MacOSXDisplay.createPeerInfo(MacOSXDisplay.java:323)
at org.lwjgl.opengl.DrawableGL.setPixelFormat(DrawableGL.java:61)
at org.lwjgl.opengl.Display.create(Display.java:846)
at org.lwjgl.opengl.Display.create(Display.java:757)
at org.lwjgl.opengl.Display.create(Display.java:739)
at bcx.ap(SourceFile:598)
at bcx.an(SourceFile:434)

-- Initialization --
Details:
Stacktrace:
at bcx.a(SourceFile:381)
at net.minecraft.client.main.Main.main(SourceFile:124)

-- System Details --
Details:
Minecraft Version: 1.10.2
Operating System: Mac OS X (x86_64) version 10.10.5
Java Version: 1.6.0_65, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 49941600 bytes (47 MB) / 144977920 bytes (138 MB) up to 2134114304 bytes (2035 MB)
JVM Flags: 5 total; -Xmx2G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 1.10.2
LWJGL: 2.9.2
OpenGL: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.
GL Caps:
Using VBOs: Yes
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: Lithos-Core 1.4 for 1.9x
Current Language: ~~ERROR~~ NullPointerException: null
Profiler Position: N/A (disabled)
CPU: <unknown>

Yes it has worked before on my mac, and quite a few times I can find ways around it, thank you so much for your help I'll try updating it!

Quote from cestislife»

Interesting seeing this error on OS X. Has the game successfully ran before on this specific computer? In any case, it would not hurt to check if your Mac has any updates that it is prompting you to install, specifically relating to your graphics drivers.