X220: Blank, backlit screen on boot

Hey everyone.
Recently had some fan errors, so I followed advice on here actually to replace it. Today I replaced the fan and took care in reassembling the rest of the laptop. However, now when I boot it up the screen stays as black and backlit as if it was perpetually loading windows. I can hear windows 7 boot up, as well as a few Apps start. I can also change the brightness of this backlit screen with function keys and such.
I checked the connections where I had previously disconnected the display several times and they're sound. Any one have any tips? The fan works fine now, but I created another problem in solving my first one.
thanks!

Thanks for the tips Hemanth. This x220 model only has vga out and I surprisingly don't have a single via port on my tv or anywhere in my apartment.
I also tried reseating the RAM a few times and performed a power drain several times, still with no result. I've had this laptop for a couple years now, so I don't have any sort of warranty on it at all. I also found A thread on here with a similar, albeit unresolved, problem here https://forums.lenovo.com/t5/X-Series-Tablet-and-Helix/X220-blank-screen-at-boot-not-even-POST-spash-screen/m-p/532083
The OP has the same problem as me. Is there anything else to try or am I more or less in a bad place?

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After the Kernel Panic, when you reinstalled, did you first disconnect all peripherals?
What size is the Hard Drive, and how much space is available?
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/Library/Caches
/System/Library/Caches
/System/Library/Extensions.mkext
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EtreCheck version: 1.9.15 (52)
Report generated August 30, 2014 at 6:56:41 PM EDT
Hardware Information: ?
    iMac (21.5-inch, Mid 2011) (Verified)
    iMac - model: iMac12,1
    1 2.5 GHz Intel Core i5 CPU: 4 cores
    4 GB RAM
Video Information: ?
    AMD Radeon HD 6750M - VRAM: 512 MB
        iMac 1920 x 1080
System Software: ?
    OS X 10.9.4 (13E28) - Uptime: 0 days 0:16:53
Disk Information: ?
    ST3120026AS disk0 : (120.03 GB)
    S.M.A.R.T. Status: Verified
        EFI (disk0s1) <not mounted>: 209.7 MB
        Untitled (disk0s2) / [Startup]: 119.17 GB (87.12 GB free)
        Recovery HD (disk0s3) <not mounted>: 650 MB
    HL-DT-STDVDRW GA32N
USB Information: ?
    Apple Inc. FaceTime HD Camera (Built-in)
    CHICONY USB NetVista Full Width Keyboard
    Apple Inc. BRCM2046 Hub
        Apple Inc. Bluetooth USB Host Controller
    Apple Computer, Inc. IR Receiver
    Apple Internal Memory Card Reader
Thunderbolt Information: ?
    Apple Inc. thunderbolt_bus
Gatekeeper: ?
    Anywhere
Kernel Extensions: ?
    [loaded]    com.nvidia.CUDA (1.1.0) Support
    [loaded]    com.sophos.kext.sav (9.0.61 - SDK 10.7) Support
    [loaded]    com.sophos.nke.swi (9.0.53 - SDK 10.8) Support
Startup Items: ?
    CUDA: Path: /System/Library/StartupItems/CUDA
    FanControlDaemon: Path: /Library/StartupItems/FanControlDaemon
Launch Daemons: ?
    [loaded]    com.adobe.fpsaud.plist Support
    [running]    com.arcsoft.eservutil.plist Support
    [running]    com.bjango.istatmenusdaemon.plist Support
    [loaded]    com.oracle.java.Helper-Tool.plist Support
    [running]    com.sophos.autoupdate.plist Support
    [running]    com.sophos.configuration.plist Support
    [running]    com.sophos.intercheck.plist Support
    [running]    com.sophos.notification.plist Support
    [running]    com.sophos.scan.plist Support
    [running]    com.sophos.sxld.plist Support
    [running]    com.sophos.webd.plist Support
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    [running]    com.bjango.istatmenusagent.plist Support
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    Firefox
Internet Plug-ins: ?
    FlashPlayer-10.6: Version: 14.0.0.176 - SDK 10.6 Support
    Flash Player: Version: 14.0.0.176 - SDK 10.6 Support
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    JavaAppletPlugin: Version: Java 7 Update 67 Check version
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    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: ?
    CUDA Preferences Support
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    Java Support
Time Machine: ?
    Time Machine not configured!
Top Processes by CPU: ?
         1%    WindowServer
         1%    fontd
         0%    firefox
         0%    SystemUIServer
         0%    SophosWebIntelligence
Top Processes by Memory: ?
    229 MB    firefox
    156 MB    SophosScanD
    152 MB    InterCheck
    131 MB    com.apple.IconServicesAgent
    115 MB    SophosAntiVirus
Virtual Memory Information: ?
    424 MB    Free RAM
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I'd start by getting rid of the following software responsible for these extensions.
Kernel Extensions: ?
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    [loaded]    com.sophos.kext.sav (9.0.61 - SDK 10.7) Support
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Use the uninstaller provided with the Sophos software. You can uninstall CUDA via the preference pane. Be sure you remove the com.nvidia.CUDA extension which is located in the /System/Library/Extensions/ folder. Not sure if Fan Control has an uninstaller so you will have to do it manually:
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Be sure to remove your two Login Items. Finally do this:
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Boot to the Recovery HD:
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OS X Mavericks- Reinstall OS X
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I recently installes windows on my macbook pro but when i boot up it shows blank black screen.please help me in fixing this problem

i recently installed windows 7(ultimate) on my 13 inch macbook pro.Everything was installed correcly and window also workd correctly in the first run,but when i shutdown the mac and booted again after some time it showd blank and screen. PLEASE help me to fix it.

Adam HH wrote:
I'm actually having this same problem with a macbook air running windows 8 CP. Exact same issue. I can't try your solution because I have no USB devices plugged in. Can you suggest anything else?
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You are not having the same problem, the OP's problem was caused by USB devices which you do not have.
I suggest you start your own thread (as this is marked solved not many will look at it)

I am having problems connecting to home wifi. It was working, but now all I get is a blank white screen. I re-booted with no success.

I am having problems connecting to home wifi. It was working, but now all I get is a blank white screen. I re-booted with no success.

Hi, blank white screen where exactly?
Make a New Location, Using network locations in Mac OS X ...
http://support.apple.com/kb/HT2712
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System Preferences>Network, click on the little gear at the bottom next to the + & - icons, (unlock lock first if locked), choose Set Service Order.
The interface that connects to the Internet should be dragged to the top of the list.
If using Wifi/Airport...
Instead of joining your Network from the list, click the WiFi icon at the top, and click join other network. Fill in everything as needed.
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208.67.222.222
208.67.220.220
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Blank Black Screen installing Windows XP Pro SP2 Retail with Boot Camp

Hi Support Forum -
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I know what are you talking about. It looks more like a video compatibility issue in Boot Camp like this one:
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If you’re not sure which volume name your USB key has, this command will show you what the possibilities are:
ls /Volumes
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Boots to a blank blue screen unless from DVD

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slee:
Have you tried:
Repair Disk
Insert Installer disk and Restart, holding down the "C" key until grey Apple appears.
Go to Installer menu (Panther and earlier) or Utilities menu (Tiger) and launch Disk Utility.
Select your HDD (manufacturer ID) in the left panel.
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Click Repair Disk on the bottom right.
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Boot freezes at blank blue screen

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Empty,Blue Screen.
http://docs.info.apple.com/article.html?artnum=106464
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2. Remove incompatible third-party startup items.
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/Library/StartupItems .......
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george

IBook will not boot - blank blue screen

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maxit,
many thanks! the problem when i boot into safe mode and prompted for user name and password, it is not recognized. i keep getting a message of incorrect password and don't know how to get around it. this all started during the latest security download.
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X220: Blank, backlit screen on boot

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