1. Tired the NVRAM & SMC Reset no change. same behaviour.
2. Apple Diagnostics Says No issues.
3. Etrecheck please find the report below
EtreCheck version: 2.9.12 (265)
Report generated 2016-06-15 20:01:58
Download EtreCheck from https://etrecheck.com
Runtime 1:53
Performance: Excellent
Click the [Support] links for help with non-Apple products.
Click the [Details] links for more information about that line.
Click the [Remove] links to remove adware.
Problem: Other problem
Description:
The Air refuses to start after hitting the power button. It takes a lot of time after hitting the power button to hearing the chime, sometimes it does not even start. When it starts it is stuck at the loading grey screen. I have to force hold the power button shut it down and press the power button again, everything seems to be fine.
Hardware Information: ⓘ
MacBook Air (13-inch, Mid 2013)
[Technical Specifications] - [User Guide] - [Warranty & Service]
MacBook Air - model: MacBookAir6,2
1 1.3 GHz Intel Core i5 CPU: 2-core
4 GB RAM Not upgradeable
BANK 0/DIMM0
2 GB DDR3 1600 MHz ok
BANK 1/DIMM0
2 GB DDR3 1600 MHz ok
Bluetooth: Good - Handoff/Airdrop2 supported
Wireless: en0: 802.11 a/b/g/n/ac
Battery: Health = Normal - Cycle count = 292
Video Information: ⓘ
Intel HD Graphics 5000
Color LCD 1440 x 900
System Software: ⓘ
OS X El Capitan 10.11.5 (15F34) - Time since boot: less than an hour
Disk Information: ⓘ
APPLE SSD SM0128F disk0 : (121.33 GB) (Solid State - TRIM: Yes)
EFI (disk0s1) <not mounted> : 210 MB
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
Macintosh HD (disk1) / : 120.10 GB (78.20 GB free)
Core Storage: disk0s2 120.47 GB Online
USB Information: ⓘ
Apple Inc. BRCM20702 Hub
Apple Inc. Bluetooth USB Host Controller
Thunderbolt Information: ⓘ
Apple Inc. thunderbolt_bus
Gatekeeper: ⓘ
Anywhere
Adware: ⓘ
~/Library/LaunchAgents/com.spigot.ApplicationManager.plist
One adware file found. [Remove]
Kernel Extensions: ⓘ
/Library/Extensions
[loaded] com.seagate.driver.PowSecDriverCore (5.2.7 (26997) - SDK 10.4 - 2016-06-10) [Support]
/Library/Extensions/Seagate Storage Driver.kext/Contents/PlugIns
[not loaded] com.seagate.driver.PowSecLeafDriver_10_4 (5.2.7 (26997) - SDK 10.4 - 2016-04-01) [Support]
[loaded] com.seagate.driver.PowSecLeafDriver_10_5 (5.2.7 (26997) - SDK 10.5 - 2016-04-01) [Support]
[not loaded] com.seagate.driver.SeagateDriveIcons (5.2.7 (26997) - SDK 10.4 - 2016-04-01) [Support]
System Launch Agents: ⓘ
[not loaded] 7 Apple tasks
[loaded] 166 Apple tasks
[running] 65 Apple tasks
System Launch Daemons: ⓘ
[not loaded] 47 Apple tasks
[loaded] 160 Apple tasks
[running] 83 Apple tasks
Launch Daemons: ⓘ
[running] com.seagate.TBDecorator.plist (2013-10-12) [Support]
User Launch Agents: ⓘ
[loaded] com.bittorrent.uTorrent.plist (2016-05-14) [Support]
[running] com.spigot.ApplicationManager.plist (2016-05-14) Adware! [Remove]
~/Library/Application Support/Spigot/ApplicationManager
User Login Items: ⓘ
iTunesHelper Application (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
Other Apps: ⓘ
[loaded] 400 Apple tasks
[running] 167 Apple tasks
Internet Plug-ins: ⓘ
Default Browser: 601 - SDK 10.11 (2016-05-17)
QuickTime Plugin: 7.7.3 (2016-05-17)
3rd Party Preference Panes: ⓘ
Paragon NTFS for Mac ® OS X (2016-04-27) [Support]
Seagate Dashboard for Mac OSX (2016-04-05) [Support]
Time Machine: ⓘ
Time Machine not configured!
Top Processes by CPU: ⓘ
5% WindowServer
2% fontd
1% kernel_task
0% cloudpaird
Top Processes by Memory: ⓘ
453 MB kernel_task
401 MB com.apple.WebKit.WebContent(3)
168 MB mdworker(11)
74 MB Safari
70 MB WindowServer
Virtual Memory Information: ⓘ
1.21 GB Free RAM
2.79 GB Used RAM (1.19 GB Cached)
0 B Swap Used
Diagnostics Information: ⓘ
Jun 15, 2016, 07:51:44 PM Self test - passed