Blank screen on startup before login

Hi, after the recent Yosemite update (10.10.3), my mac on startup, gives me the startup chime but stays in a blank screen for about 10 to 15 seconds before the apple logo shows up, followed by the login screen. This happens irrespective of whether the laptop is connected to a power adapter or not. I tried doing a safe boot and also a Disk Utility check but the problem persists. A friend of mine updated his mac a few days back and reporting the same problem to me. Any help would be appreciated. Thank you.

Exactly what is it that find to be the problem?
Open Startup Disk preferences. Select your startup volume then click on the Restart button. Then do the following:
Repair the Hard Drive and Permissions - Yosemite, Mavericks, Mountain Lion or Lion
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Repair
When the recovery menu appears select Disk Utility and press the Continue button. After Disk Utility loads select the Macintosh HD entry from the the left side list.  Click on the First Aid tab, then click on the Repair Disk button. If Disk Utility reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit Disk Utility and return to the main menu. Select Restart from the Apple menu.
If that does not help then you might try:
Resetting your Mac's PRAM and NVRAM
Intel-based Macs: Resetting the System Management Controller (SMC)

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