Updated to 10.10.4, seeing black screen, drive won't mount

Thanks.

Yosemite Cache Cleaner (Northern Softworks) clears system and/or user cache, when cache is suspected as a fault. This application was run (not installed) for the first time only after I encountered these problems.

Here's the EtreCheck report:

Problem description:

Shortly after login, perhaps exactly when the screen is set to power off (5 minutes), the screen appears black with a moving cursor. Cannot get to a login screen or desktop. The system is set >not< to go to sleep. BitTorrent Sync is shown as a high CPU offender, but has not been running when the screen went dark before.

EtreCheck version: 2.2 (132)

Report generated 6/30/15, 7:47 PM

Download EtreCheck from http://etresoft.com/etrecheck

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

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

Hardware Information: ℹ️

iMac (20-inch, Early 2008) (Verified)

iMac - model: iMac8,1

1 2.4 GHz Intel Core 2 Duo CPU: 2-core

4 GB RAM Upgradeable

BANK 0/DIMM0

2 GB DDR2 SDRAM 667 MHz ok

BANK 1/DIMM1

2 GB DDR2 SDRAM 667 MHz ok

Bluetooth: Old - Handoff/Airdrop2 not supported

Wireless: en1: 802.11 a/b/g/n

Video Information: ℹ️

ATI Radeon HD 2400 - VRAM: 128 MB

iMac 1680 x 1050

System Software: ℹ️

OS X 10.10.4 (14E46) - Time since boot: 0:7:51

Disk Information: ℹ️

ST3750640AS disk0 : (750.16 GB)

EFI (disk0s1) <not mounted> : 210 MB

Recovery HD (disk0s3) <not mounted> [Recovery]: 784 MB

Backups (disk0s4) /Volumes/Backups : 499.87 GB (386.62 GB free)

Macintosh HD (disk1) / : 248.83 GB (226.59 GB free)

Encrypted AES-XTS Unlocked

Core Storage: disk0s2 249.16 GB Online

USB Information: ℹ️

Western Digital My Passport 0748 2 TB

EFI (disk2s1) <not mounted> : 210 MB

Paul (disk2s2) /Volumes/Paul : 2.00 TB (630.69 GB free)

American Power Conversion Back-UPS BR1500G FW:865.L2 .D USB FW:L2

Apple Inc. Built-in iSight

Apple Inc. BRCM2046 Hub

Apple Inc. Bluetooth USB Host Controller

Apple Computer, Inc. IR Receiver

Firewire Information: ℹ️

PI-367 USB2.0 & 1394 & eSATA combo Drive 800mbit - 800mbit max

EFI (disk3s1) <not mounted> : 210 MB

Boot OS X (disk3s3) <not mounted> : 134 MB

iTunes (disk4) /Volumes/iTunes : 3.00 TB (392.01 GB free)

Encrypted AES-XTS Unlocked

Core Storage: disk3s2 3.00 TB Online

Gatekeeper: ℹ️

Mac App Store and identified developers

Kernel Extensions: ℹ️

/Library/Extensions

[loaded] com.sophos.kext.sav (9.2.50 - SDK 10.8) [Click for support]

[loaded] com.sophos.nke.swi (9.2.50 - SDK 10.8) [Click for support]

Launch Agents: ℹ️

[running] com.sophos.ui[redacted].plist [Click for support]

Launch Daemons: ℹ️

[running] com.bombich.ccchelper.plist [Click for support]

[running] com.crashplan.engine.plist [Click for support]

[running] com.netputing.handyPrintSystemDaemon.plist [Click for support]

[running] com.sophos.common.servicemanager.plist [Click for support]

User Login Items: ℹ️

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

ClamXavSentry UNKNOWN (missing value)

iTunes Application (/Applications/iTunes.app)

SMARTReporter Application (/Applications/SMARTReporter.app)

HandyPrintProStatus Application (/Applications/handyPrintPro.app/Contents/Library/LoginItems/HandyPrintProStatu s.app)

BitTorrent Sync Application (/Applications/BitTorrent Sync.app)

CrashPlan menu bar Application (/Applications/CrashPlan.app/Contents/Helpers/CrashPlan menu bar.app)

Carbon Copy Cloner Application (/Applications/Carbon Copy Cloner.app)

HazelHelper Application (/Library/PreferencePanes/Hazel.prefPane/Contents/MacOS/HazelHelper.app)

CCC User Agent Application (/Applications/Carbon Copy Cloner.app/Contents/Library/LoginItems/CCC User Agent.app)

Internet Plug-ins: ℹ️

Default Browser: Version: 600 - SDK 10.10

QuickTime Plugin: Version: 7.7.3

3rd Party Preference Panes: ℹ️

Hazel [Click for support]

Time Machine: ℹ️

Skip System Files: NO

Mobile backups: OFF

Auto backup: YES

Volumes being backed up:

Macintosh HD: Disk size: 248.83 GB Disk used: 22.23 GB

Destinations:

Backup [Network]

Total size: 997.71 GB

Total number of backups: 53

Oldest backup: 2015-04-20 02:44:36 +0000

Last backup: 2015-06-27 04:47:07 +0000

Size of backup disk: Excellent

Backup size 997.71 GB > (Disk size 248.83 GB X 3)

Top Processes by CPU: ℹ️

93% BitTorrent Sync

10% Activity Monitor

10% ScreensharingAgent

10% WindowServer

7% iTunes

Top Processes by Memory: ℹ️

334 MB kernel_task

242 MB BitTorrent Sync

233 MB iTunes

184 MB com.apple.WebKit.WebContent(3)

180 MB SophosScanD

Virtual Memory Information: ℹ️

45 MB Free RAM

3.95 GB Used RAM

0 B Swap Used

Diagnostics Information: ℹ️

Jun 30, 2015, 07:37:38 PM Self test - passed

Standard users cannot read /Library/Logs/DiagnosticReports.

Run as an administrator account to see more information.

First off, Bittorrent Sync is not torrent software. I have never installed or used torrent software. BT sync is non-cloud client for peer-to-peer sync, from trusted sources. Do you use DropBox? I don't, because I don't like their security model.

In fact, myself and a few colleagues use BT Sync at work to share large projects. The Fortune 50 software company I work for blocks torrents and DropBox, but they don't block Bittorrent Sync, because it's not torrent software.

I appreciate help. My system is a "total mess"? Then please explain. But snarky comments and pot shots don't help. At least you stopped short of accusing me of stealing software, which I neither participate in or condone.

But please. If you don't know what apps are, just say so. I don't expect anyone to spend time researching the apps I use, but criticizing something you clearly know nothing about in a condescending tone is not productive.

Thanks Mike. I reset Sophos' preferences to default and still had the same problem. Uninstalling Sophos seems to have done it for now. That helps me narrow the field to either configure it differently or find another AV client.

And for the record, I never have used torrents. I make the same professional recommendations to my corporate clients.

I use BT Sync and Chronosync for peer-to-peer synchronization of my desktop and download folders as I move between five of my personally-owned systems, as well as sharing documents with my family.

I'll likely do just that. This is a media server and don't use a browser.

Very interesting. I tried repairing permissions while logged in, but did not try the recovery console.

Had another 10.10.4 issue on another system that took four hours to troubleshoot today. (iPod Nano plugged into a USB hub.) Will probably call it quits this week and try again next week.