iMac will not start if external drives are connected.

EtreCheck version: 4.1 (4A162)

Report generated: 2018-03-03 13:58:11

Download EtreCheck from https://etrecheck.com

Runtime: 5:32

Performance: Below Average

Problem: Other problem

Major Issues: None

Minor Issues:

These issues do not need immediate attention but they may indicate future problems.

Unsigned files - There is unsigned software installed. It appears to be legitimate but should be reviewed.

System modifications - There are a large number of system modifications running in the background.

Low performance - EtreCheck report took over 5 minutes to run. This is unusual.

Hardware Information:

iMac (27-inch, Late 2013)

iMac Model: iMac14,2

1 3.4 GHz Intel Core i5 (i5-4670) CPU: 4-core

16 RAM At maximum

BANK 0/DIMM0

8 GB DDR3 1600 ok

BANK 1/DIMM0

8 GB DDR3 1600 ok

BANK 0/DIMM1

Empty

BANK 1/DIMM1

Empty

Video Information:

NVIDIA GeForce GTX 775M - VRAM: 2 GB

iMac 2560 x 1440

Drives:

disk0 - APPLE HDD ST1000DM003 1.00 TB (Mechanical)

Internal SATA 3 Gigabit Serial ATA

disk0s1 - EFI (MS-DOS FAT32) [EFI] 210 MB

disk0s2 - Macintosh HD (Journaled HFS+) 951.00 GB

disk0s3 - Recovery HD (HFS+) [Recovery] 650 MB

disk0s4 - B******P (NTFS) 47.84 GB

disk1 - Seagate Backup+ Desk 3.00 TB

External USB 480 Mbit/s

disk1s1 - EFI (MS-DOS FAT32) [EFI] 210 MB

disk1s2 - M*******s (Journaled HFS+) 505.53 GB

disk1s3 - O*****" (Journaled HFS+) 505.39 GB

disk1s4 - M******** (Journaled HFS+) 1.99 TB

disk2 - Seagate FA GoFlex Desk 2.00 TB

External USB 5 Gbit/s

disk2s1 32 KB

disk2s3 - P******S (MS-DOS FAT32) 1.30 TB

disk2s4 - P*******P (MS-DOS FAT32) 700.32 GB

Mounted Volumes:

disk0s2 - Macintosh HD 951.00 GB (793.26 GB free)

Journaled HFS+

Mount point: /

disk0s4 - B******P 47.84 GB (28.57 GB free)

NTFS

Mount point: /Volumes/B******P

disk1s2 - M*******s 505.53 GB (503.06 GB free)

Journaled HFS+

Mount point: /Volumes/M*******s

disk1s3 - O*****" 505.39 GB (449.56 GB free)

Journaled HFS+

Mount point: /Volumes/O*****"

disk1s4 - M******** 1.99 TB (1.57 TB free)

Journaled HFS+

Mount point: /Volumes/M********

disk2s3 - P******S 1.30 TB (1.29 TB free)

MS-DOS FAT32

Mount point: /Volumes/P********1

disk2s4 - P*******P 700.32 GB (700.16 GB free)

MS-DOS FAT32

Mount point: /Volumes/P*******P

Network:

Interface en0: Ethernet

One IPv4 address

Interface en7: iPad

Interface en1: Wi-Fi

802.11 a/b/g/n/ac

Interface en5: Bluetooth PAN

Interface bridge0: Thunderbolt Bridge

iCloud Quota: 3.84 GB available

System Software:

macOS High Sierra 10.13.3 (17D102)

Time since boot: About 2 hours

System Load: 2.50 (1 min ago) 2.04 (5 min ago) 1.86 (15 min ago)

Security:

Unsigned Files:

Launchd: /Library/LaunchAgents/com.avast.osx.secureline.userinit.plist

Executable: /Library/Application Support/AvastSecureLine/hub/userinit.sh

Details: Exact match found in the whitelist - probably OK

Launchd: ~/Library/LaunchAgents/com.avast.home.userinit.plist

Executable: ~/Library/Application Support/Avast/hub/userinit.sh

Details: Exact match found in the whitelist - probably OK

Launchd: /Library/LaunchDaemons/com.avast.osx.secureline.update.plist

Executable: /Library/Application Support/AvastSecureLine/components/update/update.sh

Details: Exact match found in the whitelist - probably OK

Launchd: /Library/LaunchDaemons/com.avast.update.plist

Executable: /Library/Application Support/Avast/components/update/update.sh

Details: Exact match found in the whitelist - probably OK

Launchd: /Library/LaunchDaemons/com.avast.osx.secureline.uninstall.plist

Executable: /Library/Application Support/AvastSecureLine/hub/autouninstall.sh

Details: Exact match found in the whitelist - probably OK

Launchd: ~/Library/LaunchAgents/com.avast.osx.secureline.home.userinit.plist

Executable: ~/Library/Application Support/AvastSecureLine/hub/userinit.sh

Details: Exact match found in the whitelist - probably OK

Launchd: /Library/LaunchDaemons/com.avast.osx.secureline.init.plist

Executable: /Library/Application Support/AvastSecureLine/hub/init.sh

Details: Exact match found in the whitelist - probably OK

Launchd: /Library/LaunchDaemons/com.microsoft.office.licensing.helper.plist

Executable: /Library/PrivilegedHelperTools/com.microsoft.office.licensing.helper

Details: Exact match found in the whitelist - probably OK

Launchd: /Library/LaunchDaemons/com.avast.init.plist

Executable: /Library/Application Support/Avast/hub/init.sh

Details: Exact match found in the whitelist - probably OK

Launchd: /Library/LaunchAgents/com.avast.userinit.plist

Executable: /Library/Application Support/Avast/hub/userinit.sh

Details: Exact match found in the whitelist - probably OK

Launchd: /Library/LaunchDaemons/com.avast.uninstall.plist

Executable: /Library/Application Support/Avast/hub/autouninstall.sh

Details: Exact match found in the whitelist - probably OK

Launchd: /Library/LaunchDaemons/com.adobe.SwitchBoard.plist

Executable: /Library/Application Support/Adobe/SwitchBoard/SwitchBoard.app/Contents/MacOS/launch.switchboard

Details: Exact match found in the whitelist - probably OK

Kernel Extensions:

/Library/Application Support/Avast/components/fileshield/signed

[Loaded] AvastFileShield.kext (AVAST Software a.s., 4.0.0 - SDK 10.12)

/Library/Application Support/Avast/components/proxy/signed

[Loaded] AvastPacketForwarder.kext (AVAST Software a.s., 2.1 - SDK 10.12)

/Library/Extensions

[Loaded] MB_MBAM_Protection.kext (Malwarebytes Corporation, 3.2 - SDK 10.13)

System Launch Agents:

System Launch Daemons:

Launch Agents:

Launch Daemons:

User Launch Agents:

User Login Items:

EaseUS Data Recovery Wizard Tray Application (installed 2018-03-03)

(/Applications/EaseUS Data Recovery Wizard.app/Contents/MacOS/EaseUS Data Recovery Wizard Tray.app)

iTunesHelper Application (Apple, Inc. - installed 2018-01-24)

(/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)

TomTomHOMERunner Application

(~/Library/Application Support/TomTom HOME/TomTomHOMERunner.app)

HP Product Research SMLoginItem (HP Inc. - installed 2018-02-26)

(/Library/Printers/hp/Utilities/HPPU Plugins/ProductImprovementStudy.hptask/Contents/Helpers/HP Product Research Manager.app/Contents/Library/LoginItems/HP Product Research.app)

HP Device Monitor SMLoginItem (HP Inc. - installed 2018-02-26)

(/Library/Printers/hp/Frameworks/HPDeviceMonitoring.framework/Versions/1.0/Help ers/HP Device Monitor Manager.app/Contents/Library/LoginItems/HP Device Monitor.app)

Avast Passwords Service SMLoginItem (AVAST Software a.s. - installed 2018-01-24)

(/Applications/Avast Passwords.app/Contents/Library/LoginItems/Avast Passwords Service.app)

6H4HRTU5E3.com.avast.osx.secureline.avastsecurelinehelper SMLoginItem (AVAST Software a.s. - installed 2018-03-01)

(/Applications/AvastSecureLine.app/Contents/Library/LoginItems/6H4HRTU5E3.com.a vast.osx.secureline.avastsecurelinehelper.app)

com.adobe.SwitchBoard.monitor.plist MachInit

(/etc/mach_init_per_user.d/com.adobe.SwitchBoard.monitor.plist)

Internet Plug-ins:

AdobeExManDetect: AdobeExManDetect 1.1.0.0 (installed 2016-11-10)

FlashPlayer-10.6: 28.0.0.161 (installed 2018-02-07)

QuickTime Plugin: 7.7.3 (installed 2018-01-28)

AdobePDFViewerNPAPI: 17.012.20098 (installed 2018-02-25)

AdobePDFViewer: 18.011.20038 (installed 2018-02-25)

AdobeAAMDetect: 3.0.0.0 (installed 2016-11-15)

Flash Player: 28.0.0.161 (installed 2018-02-07)

SharePointBrowserPlugin: 14.7.7 (installed 2017-09-26)

Safari Extensions:

3rd Party Preference Panes:

Flash Player (installed 2018-02-01)

Time Machine:

Skip System Files: No

Mobile backups: No

Auto backup: Yes

Volumes being backed up:

Macintosh HD: Disk size: 951.00 GB - Disk used: 157.74 GB

Destinations:

B***** [Local] (Last used)

Total size: 1.99 TB

Total number of backups: 106

Oldest backup: 2016-04-03 18:16:49

Last backup: 2018-03-03 13:24:04

Top Processes by CPU:

Top Processes by Memory:

Top Processes by Network Use:

Top Processes by Energy Use:

Virtual Memory Information:

Software Installs (past 30 days):

Diagnostics Information (past 7 days):

2018-03-03 13:35:51 Universal Translator.app Crash

2018-03-03 11:52:33 Adobe Photoshop CS6.app Hang

2018-03-03 11:48:57 Last Shutdown Cause: 0 - Power loss

2018-02-26 15:45:51 AAM Updates Notifier.app Crash

End of report

hope this is what you requested.

problem with screen solved

yes that has solved my problem. Thanks for the help.