Q: My computer has been locking up.

Thanks for your reply Allan. In my utilities folder there is a disk utility, and within that I check first aid. It has not found anything in need of repair.

When my computer locks up, it does not respond. I have to reboot it, then it goes back to the internet page that I was on. I am able to proceed after that.

Safari...sorry, I intended to mention that.

No, the only way I am able to restart my computer after it locks up is to turn the power button off and back on.

Here it is:

EtreCheck version: 2.9.11 (264)

Report generated 2016-04-21 05:17:39

Download EtreCheck from https://etrecheck.com

Runtime 2:14

Performance: Excellent

Click the [Support] links for help with non-Apple products.

Click the [Details] links for more information about that line.

Check Apple signatures: Enabled

Problem: Beachballing

Description:

and locking up while on the internet.

Hardware Information: ⓘ

    iMac (21.5-inch, Mid 2010)

    [Technical Specifications] - [User Guide] - [Warranty & Service]

    iMac - model: iMac11,2

    1 3.06 GHz Intel Core i3 CPU: 2-core

    4 GB RAM Upgradeable - [Instructions]

        BANK 0/DIMM0

            Empty  

        BANK 1/DIMM0

            Empty  

        BANK 0/DIMM1

            2 GB DDR3 1333 MHz ok

        BANK 1/DIMM1

            2 GB DDR3 1333 MHz ok

    Bluetooth: Old - Handoff/Airdrop2 not supported

    Wireless:  en1: 802.11 a/b/g/n

Video Information: ⓘ

    ATI Radeon HD 4670 - VRAM: 256 MB

        iMac 1920 x 1080

System Software: ⓘ

    OS X El Capitan 10.11.4 (15E65) - Time since boot: less than an hour

Disk Information: ⓘ

    ST3500418AS disk0 : (500.11 GB) (Rotational)

        EFI (disk0s1) <not mounted> : 210 MB

        Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB

        Macintosh HD (disk1) / : 498.88 GB (342.64 GB free)

            Encrypted AES-XTS Unlocked

            Core Storage: disk0s2 499.25 GB Online

    HL-DT-STDVDRW  GA32N   ()

USB Information: ⓘ

    Apple Card Reader

    Apple Inc. BRCM2046 Hub

        Apple Inc. Bluetooth USB Host Controller

    Apple, Inc. Keyboard Hub

        Apple Inc. Apple Keyboard

    Apple Computer, Inc. IR Receiver

    Apple Inc. Built-in iSight

Gatekeeper: ⓘ

    Mac App Store and identified developers

Kernel Extensions: ⓘ

        /System/Library/Extensions

    [not loaded]    com.kodak.print.printerdock.merge (1.0.0 - 2016-04-07) [Support]

System Launch Agents: ⓘ

    [not loaded]    8 Apple tasks

    [loaded]    165 Apple tasks

    [running]    65 Apple tasks

System Launch Daemons: ⓘ

    [not loaded]    44 Apple tasks

    [loaded]    159 Apple tasks

    [running]    86 Apple tasks

Launch Agents: ⓘ

    [failed]    com.adobe.ARMDCHelper.cc24aef4a1b90ed56a...plist (2015-10-24) [Support]

Launch Daemons: ⓘ

    [loaded]    com.adobe.ARMDC.Communicator.plist (2015-10-24) [Support]

    [loaded]    com.adobe.ARMDC.SMJobBlessHelper.plist (2015-10-24) [Support]

    [loaded]    com.adobe.fpsaud.plist (2016-04-05) [Support]

    [loaded]    com.malwarebytes.MBAMHelperTool.plist (2016-03-17) [Support]

User Launch Agents: ⓘ

    [failed]    com.adobe.ARM.[...].plist (2013-01-15) [Support]

    [failed]    com.apple.CSConfigDotMacCert-[...]@me.com-SharedServices.Agent.plist (2011-04-02) - /System/Library/Frameworks/CoreServices.framework/Frameworks/OSServices.framewo rk/Versions/A/Support/CSConfigDotMacCert: Executable not found!

    [loaded]    com.google.keystone.agent.plist (2016-03-03) [Support]

    [loaded]    com.spotify.webhelper.plist (2016-02-19) [Support]

Other Apps: ⓘ

    [running]    com.etresoft.EtreCheck.97632

    [loaded]    404 Apple tasks

    [running]    164 Apple tasks

Internet Plug-ins: ⓘ

    FlashPlayer-10.6: 21.0.0.213 - SDK 10.6 (2016-04-07) [Support]

    QuickTime Plugin: 7.7.3 (2016-03-26)

    AdobePDFViewerNPAPI: 15.010.20060 - SDK 10.8 (2016-03-10) [Support]

    AdobePDFViewer: 15.010.20060 - SDK 10.8 (2016-03-10) [Support]

    Flash Player: 21.0.0.213 - SDK 10.6 (2016-04-07) Outdated! Update

    Default Browser: 601 - SDK 10.11 (2016-03-26)

    Google Earth Web Plug-in: 7.1 (2013-10-07) [Support]

    Silverlight: 5.1.41212.0 - SDK 10.6 (2016-02-19) [Support]

    DirectorShockwave: 11.5.9r620 (2011-02-03) [Support]

    iPhotoPhotocast: 7.0 - SDK 10.7 (2012-03-31)

User internet Plug-ins: ⓘ

    CitrixOnlineWebDeploymentPlugin: 1.0.105 (2013-04-25) [Support]

    WebEx64: 1.0 - SDK 10.6 (2013-03-18) [Support]

Safari Extensions: ⓘ

    RadioRage - Mindspark Interactive Network - http://www.radiorage.com (2016-03-27)

3rd Party Preference Panes: ⓘ

    Flash Player (2016-04-05) [Support]

    MacFUSE (2008-12-19) [Support]

    MusicManager (2015-11-17) [Support]

Time Machine: ⓘ

    Time Machine not configured!

Top Processes by CPU: ⓘ

         2%    WindowServer

         1%    fontd

         0%    kernel_task

         0%    askpermissiond

Top Processes by Memory: ⓘ

    487 MB    com.apple.WebKit.WebContent(4)

    473 MB    kernel_task

    197 MB    helpd

    147 MB    mds_stores

    98 MB    ocspd

Virtual Memory Information: ⓘ

    1.12 GB    Free RAM

    2.88 GB    Used RAM (1.11 GB Cached)

    0 B    Swap Used

Diagnostics Information: ⓘ

    Apr 21, 2016, 05:10:19 AM    Self test - passed

    Apr 18, 2016, 12:52:49 PM    ~/Library/Logs/DiagnosticReports/com.apple.WebKit.Plugin.64_2016-04-18-125249_[ redacted].crash

        /System/Library/Frameworks/WebKit.framework/Versions/A/XPCServices/com.apple.We bKit.Plugin.64.xpc/Contents/MacOS/com.apple.WebKit.Plugin.64

I did click the Safari tab, chose quit, and restarted Safari, but it still locks up. Once it locks up, I am not able to do anything. Thanks for helping!!!

I did both. Thanks for your input.