Ideacenter B540 Won't boot no display with black screen

Hello,
I bought an Ideacentre B540 two years ago and today all of sudden compuer would not boot.
When I press the power button, the only LED comes on is the one on the far right corner at the bottom of the screen.
There is no display of any kind whatsoever.
The system's power goes off only when I hold down the power button for about 3 seconds.
Is there something wrong with the motherboard or the power supply?

Hi paradisehi,
Welcome to Lenovo Community Forums!
Few Things you can try
Power cycle
Unplug the computer from the Outlet.
Hold the Power Button down for 10 secs.
reconnect the computer to the power Outlet and try to turn it ON.
Try the Buttons on the Front
1. Turn the computer ON and press the Screen ON/OFF Button
2. Also try pressing the Display Switch button
If your Comfortable you can also try reseating few components like:
RAM and HDD
You can refer to this Video Guide
https://www.youtube.com/watch?v=_zSdAE3CBA8
Or you can refer to your system's Maintenance Manual
http://download.lenovo.com/consumer/desktop_pub/lenovo_ideacentre_b540b540p_hmm_20120713.pdf
Hope this helps
Cheers!
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Flex 4.6, AIR 3.1: "Export Release Build" and ADT tool chain produce working APK and IPA files.
Flex 4.6, AIR 3.7 using overlay procedure: "Export Release Build" produces working APK and IPA files, ADT tool chain produces working APK file but IPA file loads black screen on Apple devices.
More notes:
I had made a back up of the "4.6.0" directory that holds the Flex and AIR SDK files. If I replace the overlayed Flex 4.6.0 SDK directory with the original (which contains AIR 3.1) and revert the namespace back to 3.1 in my project, everything goes back to normal and I get working apps via both methods described above.
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<?xml version="1.0" encoding="utf-8" standalone="no"?>
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</application>
TestApp.mxml
<?xml version="1.0" encoding="utf-8"?>
<s:ViewNavigatorApplication xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" firstView="TestView" applicationDPI="160">
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</s:ViewNavigatorApplication>
TestView.mxml
<?xml version="1.0" encoding="utf-8"?>
<s:View xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" title="Test App" >
    <s:VGroup width="100%" height="100%" verticalAlign="middle" horizontalAlign="center" >
        <s:Label text="Hello World!" />
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> adt -package -target ipa-test -provisioning-profile [PROVISIONING_FILE] -storetype pkcs12 -keystore [CERTIFICATE] TestApp.ipa TestApp-app.xml TestApp.swf
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> mxmlc +configname=airmobile TestApp.mxml
> adt -prepare TestApp.airi TestApp-app.xml TestApp.swf
> adt -package -target ipa-test -provisioning-profile [PROVISIONING_FILE] -storetype pkcs12 -keystore [CERTIFICATE] TestApp.ipa TestApp.airi
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MIME types: MIME type Description File extensions
application/x-msoffice14 14.0.4730.1010 .*
Name: Microsoft Office 2010
Description: The plug-in allows you to open and edit files using Microsoft Office applications
Version: 14.0.4761.1000
Location: C:\PROGRA2\MICROS1\Office14\NPSPWRAP.DLL
Type: NPAPI
Disable
MIME types: MIME type Description File extensions
application/x-sharepoint SharePoint Plug-in for Firefox
Disable  Always allowed?
Native Client
Name: Native Client
Version:
Location: C:\Users\njdp\AppData\Local\Google\Chrome\Application\32.0.1700.72\ppGoogleNaClPluginChro me.dll
Type: PPAPI (in-process)
Disable
MIME types: MIME type Description File extensions
application/x-nacl Native Client Executable .
application/x-pnacl Portable Native Client Executable .
Disable  Always allowed?
Chrome PDF Viewer (Disabled)
Name: Chrome PDF Viewer
Version:
Location: C:\Users\njdp\AppData\Local\Google\Chrome\Application\32.0.1700.72\pdf.dll
Type: PPAPI (in-process)
Enable
MIME types: MIME type Description File extensions
application/pdf Portable Document Format .pdf
application/x-google-chrome-print-preview-pdf Portable Document Format .pdf
Enable  Always allowed?
Adobe Reader - Version: 11.0.05.3
Adobe PDF Plug-In For Firefox and Netscape 11.0.05
Name: Adobe Acrobat
Description: Adobe PDF Plug-In For Firefox and Netscape 11.0.05
Version: 11.0.05.3
Location: C:\Program Files (x86)\Adobe\Reader 11.0\Reader\AIR\nppdf32.dll
Type: NPAPI
Disable
MIME types: MIME type Description File extensions
application/pdf Acrobat Portable Document Format .pdf
application/vnd.adobe.pdfxml Adobe PDF in XML Format .pdfxml
application/vnd.adobe.x-mars Adobe PDF in XML Format .mars
application/vnd.fdf Acrobat Forms Data Format .fdf
application/vnd.adobe.xfdf XML Version of Acrobat Forms Data Format .xfdf
application/vnd.adobe.xdp+xml Acrobat XML Data Package .xdp
application/vnd.adobe.xfd+xml Adobe FormFlow99 Data File .xfd
Disable  Always allowed?
Java(TM) (2 files) - Version: 10.45.2.18
NPRuntime Script Plug-in Library for Java(TM) Deploy
Name: Java Deployment Toolkit 7.0.450.18
Description: NPRuntime Script Plug-in Library for Java(TM) Deploy
Version: 10.45.2.18
Location: C:\Program Files (x86)\Java\jre7\bin\dtplugin\npDeployJava1.dll
Type: NPAPI
Disable
MIME types: MIME type Description File extensions
application/java-deployment-toolkit
Name: Java(TM) Platform SE 7 U45
Description: Next Generation Java Plug-in 10.45.2 for Mozilla browsers
Version: 10.45.2.18
Location: C:\Program Files (x86)\Java\jre7\bin\plugin2\npjp2.dll
Type: NPAPI
Disable
MIME types: MIME type Description File extensions
application/x-java-applet Java Applet
application/x-java-bean JavaBeans
application/x-java-vm
application/x-java-applet;version=1.1.1
application/x-java-bean;version=1.1.1
application/x-java-applet;version=1.1
application/x-java-bean;version=1.1
application/x-java-applet;version=1.2
application/x-java-bean;version=1.2
application/x-java-applet;version=1.1.3
application/x-java-bean;version=1.1.3
application/x-java-applet;version=1.1.2
application/x-java-bean;version=1.1.2
application/x-java-applet;version=1.3
application/x-java-bean;version=1.3
application/x-java-applet;version=1.2.2
application/x-java-bean;version=1.2.2
application/x-java-applet;version=1.2.1
application/x-java-bean;version=1.2.1
application/x-java-applet;version=1.3.1
application/x-java-bean;version=1.3.1
application/x-java-applet;version=1.4
application/x-java-bean;version=1.4
application/x-java-applet;version=1.4.1
application/x-java-bean;version=1.4.1
application/x-java-applet;version=1.4.2
application/x-java-bean;version=1.4.2
application/x-java-applet;version=1.5
application/x-java-bean;version=1.5
application/x-java-applet;version=1.6
application/x-java-bean;version=1.6
application/x-java-applet;version=1.7
application/x-java-bean;version=1.7
application/x-java-applet;jpi-version=1.7.0_45
application/x-java-bean;jpi-version=1.7.0_45
application/x-java-vm-npruntime
application/x-java-applet;deploy=10.45.2
application/x-java-applet;javafx=2.2.45
Disable  Always allowed?
Windows Live Photo Gallery - Version: 15.4.3508.1109_ship.wlx.w4m4 (ship)
NPWLPG
Name: Windows Live Photo Gallery
Description: NPWLPG
Version: 15.4.3508.1109_ship.wlx.w4m4 (ship)
Location: C:\Program Files (x86)\Windows Live\Photo Gallery\NPWLPG.dll
Type: NPAPI
Disable
MIME types: MIME type Description File extensions
application/x-wlpg3-detect Windows Live Photo Gallery .wlpg
application/x-wlpg-detect Windows Live Photo Gallery .wlpg
Disable  Always allowed?
Google Update - Version: 1.3.22.3
Name: Google Update
Version: 1.3.22.3
Location: C:\Users\njdp\AppData\Local\Google\Update\1.3.22.3\npGoogleUpdate3.dll
Type: NPAPI
Disable
MIME types: MIME type Description File extensions
application/x-vnd.google.update3webcontrol.3
application/x-vnd.google.oneclickctrl.9
Disable  Always allowed?
Silverlight - Version: 5.1.20913.0
Name: Silverlight Plug-In
Version: 5.1.20913.0
Location: c:\Program Files (x86)\Microsoft Silverlight\5.1.20913.0\npctrl.dll
Type: NPAPI
Disable
MIME types: MIME type Description File extensions
application/x-silverlight npctrl .scr
application/x-silverlight-2
Disable  Always allowed?

4s bricked after trying new update, stuck with black screen with apple logo how can i fix this

Update bricked my 4s
phone , stuck with black screen with apple logo ..
how can I fix this

Greetings r1042,
Welcome to the Apple Support Communities!
I understand that your iPhone is not booting up past the Apple logo. In this situation, I would recommend working through the troubleshooting steps located in the attached article.
If your iPhone, iPad, or iPod touch doesn't respond or doesn't turn on - Apple Support
If your device gets stuck during startup
When starting up, you might see the Apple logo or a red or blue screen for a long time, or your device might restart again. Try these steps:
Make sure that you have iTunes 12 or later on your computer.
Put your device in recovery mode.
When you get the option to restore or update, select Update. This will reinstall iOS without erasing your data.
Have a great day,
Joe

Ideacenter B540 Won't boot no display with black screen

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