Modpacks crash upon clicking "Play" and takes me right back to the launcher.

[Dyllbug]

1. ---- Minecraft Crash Report ----
2. // Oops.
3.  
4. Time: 5/25/15 4:15 PM
5. Description: Initializing game
6.  
7. org.lwjgl.LWJGLException: Pixel format not accelerated
8.         at org.lwjgl.opengl.WindowsPeerInfo.nChoosePixelFormat(Native Method)
9.         at org.lwjgl.opengl.WindowsPeerInfo.choosePixelFormat(WindowsPeerInfo.java:52)
10.         at org.lwjgl.opengl.WindowsDisplay.createWindow(WindowsDisplay.java:252)
11.         at org.lwjgl.opengl.Display.createWindow(Display.java:306)
12.         at org.lwjgl.opengl.Display.create(Display.java:848)
13.         at org.lwjgl.opengl.Display.create(Display.java:757)
14.         at org.lwjgl.opengl.Display.create(Display.java:739)
15.         at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:452)
16.         at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:867)
17.         at net.minecraft.client.main.Main.main(SourceFile:148)
18.         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
19.         at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
20.         at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
21.         at java.lang.reflect.Method.invoke(Unknown Source)
22.         at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
23.         at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
24.  
25.  
26. A detailed walkthrough of the error, its code path and all known details is as follows:
27. ---------------------------------------------------------------------------------------
28.  
29. -- Head --
30. Stacktrace:
31.         at org.lwjgl.opengl.WindowsPeerInfo.nChoosePixelFormat(Native Method)
32.         at org.lwjgl.opengl.WindowsPeerInfo.choosePixelFormat(WindowsPeerInfo.java:52)
33.         at org.lwjgl.opengl.WindowsDisplay.createWindow(WindowsDisplay.java:252)
34.         at org.lwjgl.opengl.Display.createWindow(Display.java:306)
35.         at org.lwjgl.opengl.Display.create(Display.java:848)
36.         at org.lwjgl.opengl.Display.create(Display.java:757)
37.         at org.lwjgl.opengl.Display.create(Display.java:739)
38.         at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:452)
39.  
40. -- Initialization --
41. Details:
42. Stacktrace:
43.         at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:867)
44.         at net.minecraft.client.main.Main.main(SourceFile:148)
45.         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
46.         at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
47.         at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
48.         at java.lang.reflect.Method.invoke(Unknown Source)
49.         at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
50.         at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
51.  
52. -- System Details --
53. Details:
54.         Minecraft Version: 1.7.10
55.         Operating System: Windows 7 (amd64) version 6.1
56.         Java Version: 1.8.0_45, Oracle Corporation
57.         Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
58.         Memory: 185978384 bytes (177 MB) / 573046784 bytes (546 MB) up to 3817865216 bytes (3641 MB)
59.         Mod Pack: ~~ERROR~~ NullPointerException: null
60.         LiteLoader Mods: ~~ERROR~~ NullPointerException: null
61.         LaunchWrapper: 38 active transformer(s)
62.           - Transformer: cpw.mods.fml.common.asm.transformers.PatchingTransformer
63.           - Transformer: optifine.OptiFineClassTransformer
64.           - Transformer: squeek.applecore.asm.TransformerModuleHandler
65.           - Transformer: cpw.mods.fml.common.asm.transformers.MarkerTransformer
66.           - Transformer: cpw.mods.fml.common.asm.transformers.SideTransformer
67.           - Transformer: cpw.mods.fml.common.asm.transformers.EventSubscriptionTransformer
68.           - Transformer: codechicken.lib.asm.ClassHeirachyManager
69.           - Transformer: codechicken.core.asm.InterfaceDependancyTransformer
70.           - Transformer: codechicken.core.asm.TweakTransformer
71.           - Transformer: codechicken.core.asm.DelegatedTransformer
72.           - Transformer: codechicken.core.asm.DefaultImplementationTransformer
73.           - Transformer: fastcraft.asm.FastCraftTransformer
74.           - Transformer: invtweaks.forge.asm.ContainerTransformer
75.           - Transformer: codechicken.nei.asm.NEITransformer
76.           - Transformer: schmoller.tubes.asm.MinecraftTransformer
77.           - Transformer: com.mumfrey.liteloader.transformers.event.EventProxyTransformer
78.           - Transformer: com.mumfrey.liteloader.launch.LiteLoaderTransformer
79.           - Transformer: com.mumfrey.liteloader.client.transformers.CrashReportTransformer
80.           - Transformer: cpw.mods.fml.common.asm.transformers.DeobfuscationTransformer
81.           - Transformer: cpw.mods.fml.common.asm.transformers.AccessTransformer
82.           - Transformer: net.minecraftforge.transformers.ForgeAccessTransformer
83.           - Transformer: codechicken.core.asm.CodeChickenAccessTransformer
84.           - Transformer: nf.fr.ephys.cookiecore.common.core.CookieCoreAT
85.           - Transformer: invtweaks.forge.asm.ITAccessTransformer
86.           - Transformer: cpw.mods.fml.common.asm.transformers.ModAccessTransformer
87.           - Transformer: cpw.mods.fml.common.asm.transformers.ItemStackTransformer
88.           - Transformer: ivorius.psychedelicraftcore.PsychedelicraftClassTransformer
89.           - Transformer: cpw.mods.fml.common.asm.transformers.TerminalTransformer
90.           - Transformer: com.mumfrey.liteloader.client.transformers.JoinGamePacketTransformer
91.           - Transformer: com.mumfrey.liteloader.client.transformers.ServerChatPacketTransformer
92.           - Transformer: com.mumfrey.liteloader.client.transformers.LiteLoaderEventInjectionTransformer
93.           - Transformer: com.mumfrey.liteloader.client.transformers.LiteLoaderCallbackInjectionTransformer
94.           - Transformer: com.mumfrey.liteloader.client.transformers.MinecraftOverlayTransformer
95.           - Transformer: com.mumfrey.liteloader.client.transformers.LoginSuccessPacketTransformer
96.           - Transformer: com.mumfrey.liteloader.client.transformers.CustomPayloadPacketTransformer
97.           - Transformer: com.mumfrey.liteloader.client.transformers.ServerCustomPayloadPacketTransformer
98.           - Transformer: com.mumfrey.liteloader.client.transformers.ChatPacketTransformer
99.           - Transformer: com.thevoxelbox.voxelmap.litemod.VoxelMapTransformer
100.         JVM Flags: 3 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx4096m -XX:MaxPermSize=256m
101.         AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
102.         IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
103.         FML:
104.         Launched Version: 1.7.10-Forge10.13.2.1291
105.         LWJGL: 2.9.1
106.         OpenGL: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.
107.         GL Caps:
108.         Is Modded: Definitely; Client brand changed to 'fml,forge'
109.         Type: Client (map_client.txt)
110.         Resource Packs: []
111.         Current Language: ~~ERROR~~ NullPointerException: null
112.         Profiler Position: N/A (disabled)
113.         Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
114.         Anisotropic Filtering: Off (1)

[EvilOwl]

Minecraft didn't found a proper gpu driver/gpu hardware to show anything.

Pixel format not accelerated

 OpenGL: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.

Are you trying to play on a potato or you just didn't install any graphic drivers?