My iMac sometimes will not switch on.

I have a late 2012 27" imac. Its always plugged in to an APC500CS UPS but isnt always left swithced on. I frequently have to reset the SMC as the MAC won't switch on, is this a common problem or is there something I can do to prevent this from happening?

Thanks for your reply. I thought it might now be okay as it was in sleep mode all night and woke up this morning. However, left it in sleep mode over lunch today and when I came back it had shut down and had to reset SMC to restart. Turned off Time Machine yesterday in case it was something to do with external drive.
Here's the etrecheck report:
Problem description:
iMac 27inch late 2012 often shuts down completely while in sleep mode and then will not restart without SMU reset.
EtreCheck version: 2.1.5 (108)
Report generated 31 December 2014 14:57:49 GMT
Click the [Support] links for help with non-Apple products.
Click the [Details] links for more information about that line.
Click the [Adware] links for help removing adware.
Hardware Information: ℹ️
  iMac (27-inch, Late 2012) (Verified)
  iMac - model: iMac13,2
  1 3.2 GHz Intel Core i5 CPU: 4-core
  8 GB RAM Upgradeable
  BANK 0/DIMM0
  4 GB DDR3 1600 MHz ok
  BANK 1/DIMM0
  4 GB DDR3 1600 MHz ok
  BANK 0/DIMM1
  empty empty empty empty
  BANK 1/DIMM1
  empty empty empty empty
  Bluetooth: Good - Handoff/Airdrop2 supported
  Wireless:  en1: 802.11 a/b/g/n
Video Information: ℹ️
  NVIDIA GeForce GTX 680MX - VRAM: 2048 MB
  iMac 2560 x 1440
System Software: ℹ️
  OS X 10.10.1 (14B25) - Uptime: 0:35:47
Disk Information: ℹ️
  APPLE HDD ST1000DM003 disk0 : (1 TB)
  EFI (disk0s1) <not mounted> : 210 MB
  Macintosh HD (disk0s2) / : 999.35 GB (885.10 GB free)
  Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
USB Information: ℹ️
  HP HP Link-5 micro dongle
  Apple Inc. FaceTime HD Camera (Built-in)
  Apple Inc. BRCM20702 Hub
  Apple Inc. Bluetooth USB Host Controller
Thunderbolt Information: ℹ️
  Apple Inc. thunderbolt_bus
Gatekeeper: ℹ️
  Mac App Store and identified developers
Kernel Extensions: ℹ️
  /Library/Extensions
  [not loaded] com.wacom.kext.ftdi (1 - SDK 10.9) [Support]
Launch Agents: ℹ️
  [not loaded] com.adobe.AAM.Updater-1.0.plist [Support]
  [loaded] com.adobe.AdobeCreativeCloud.plist [Support]
Launch Daemons: ℹ️
  [loaded] com.adobe.fpsaud.plist [Support]
  [loaded] com.microsoft.office.licensing.helper.plist [Support]
User Launch Agents: ℹ️
  [loaded] com.adobe.AAM.Updater-1.0.plist [Support]
  [loaded] com.adobe.ARM.[...].plist [Support]
  [loaded] com.google.keystone.agent.plist [Support]
User Login Items: ℹ️
  iTunesHelper Application (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
Internet Plug-ins: ℹ️
  AdobeAAMDetect: Version: AdobeAAMDetect 2.0.0.0 - SDK 10.7 [Support]
  FlashPlayer-10.6: Version: 16.0.0.235 - SDK 10.6 [Support]
  Default Browser: Version: 600 - SDK 10.10
  AdobePDFViewerNPAPI: Version: 11.0.10 - SDK 10.6 [Support]
  AdobePDFViewer: Version: 11.0.10 - SDK 10.6 [Support]
  Flash Player: Version: 16.0.0.235 - SDK 10.6 [Support]
  QuickTime Plugin: Version: 7.7.3
  SharePointBrowserPlugin: Version: 14.4.4 - SDK 10.6 [Support]
  Silverlight: Version: 5.1.30317.0 - SDK 10.6 [Support]
  WacomTabletPlugin: Version: WacomTabletPlugin 2.1.0.6 - SDK 10.9 [Support]
  JavaAppletPlugin: Version: 15.0.0 - SDK 10.10 Check version
User internet Plug-ins: ℹ️
  Picasa: Version: 1.0 - SDK 10.4 [Support]
3rd Party Preference Panes: ℹ️
  Flash Player  [Support]
Time Machine: ℹ️
  Mobile backups: OFF
  Auto backup: NO - Auto backup turned off
  Volumes being backed up:
  Macintosh HD: Disk size: 999.35 GB Disk used: 114.24 GB
  Destinations:
  Eric Drive [Local]
  Total size: 2.00 TB
  Total number of backups: 36
  Oldest backup: 2014-09-21 16:27:31 +0000
  Last backup: 2014-12-30 19:36:40 +0000
  Size of backup disk: Adequate
  Backup size 2.00 TB > (Disk used 114.24 GB X 3)
Top Processes by CPU: ℹ️
      2% WindowServer
      1% fontd
      0% com.apple.WebKit.Plugin.64
      0% AppleSpell
      0% dpd
Top Processes by Memory: ℹ️
  206 MB Finder
  206 MB com.apple.WebKit.WebContent
  137 MB mds_stores
  103 MB Safari
  86 MB com.apple.WebKit.Plugin.64
Virtual Memory Information: ℹ️
  5.30 GB Free RAM
  1.99 GB Active RAM
  470 MB Inactive RAM
  821 MB Wired RAM
  1.10 GB Page-ins
  0 B Page-outs
Diagnostics Information: ℹ️
  Dec 31, 2014, 02:22:35 PM Self test - passed
  Dec 30, 2014, 02:18:37 PM /Library/Logs/DiagnosticReports/Finder_2014-12-30-141837_[redacted].cpu_resourc e.diag [Details]

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