CDH 5.5 quickstart doesn't boot up, freezes at CentOs screen; worked fine last moth

[#1]

My VM CDH 5.5 quickstart was working perfectly fine yesterday night, but this morning it doesn't start up the usual way:
It stops after having loaded the white bar of CentOs (I'm using the RedHat 6.5 64 bit). If I press Esc, or Alt+Tab, the processes are loaded normally, all with [ ok ], but after " starting hue [   ok   ]", it restarts from scratch and keeps looping in this endless booting.

Restarting both my laptop and the machine has done nothing and I am desperate for solutions, as I have a very close deadline this week.

PS. one weird thing I see during the booting up is that there is some pure code, starting with an "if(first time boot up)..."

EDIT: here are the last lines the log prints before freezing:

00:01:39.081253 VMMDev: Guest Log: VBoxService 5.0.20 r106931 (verbosity: 0) linux.amd64 (Apr 28 2016 15:21:19) release log

00:01:39.081316 VMMDev: Guest Log: 00:00:00.000112 main Log opened 2016-06-08T11:46:58.556805000Z

00:01:39.081435 VMMDev: Guest Log: 00:00:00.000121 main OS Product: Linux

00:01:39.081489 VMMDev: Guest Log: 00:00:00.000121 main OS Release: 2.6.32-358.el6.x86_64

00:01:39.081535 VMMDev: Guest Log: 00:00:00.000148 main OS Version: #1 SMP Fri Feb 22 00:31:26 UTC 2013

00:01:39.081584 VMMDev: Guest Log: 00:00:00.000195 main Executable: /opt/VBoxGuestAdditions-5.0.20/sbin/VBoxService

00:01:39.081611 VMMDev: Guest Log: 00:00:00.000196 main Process ID: 1497

00:01:39.081634 VMMDev: Guest Log: 00:00:00.000197 main Package type: LINUX_64BITS_GENERIC

00:01:39.082442 VMMDev: Guest Log: 00:00:00.001051 main 5.0.20 r106931 started. Verbose level = 0

00:01:39.088320 GUI: UISession::sltAdditionsChange: GA state change event came, notifying listeners.

00:01:39.088426 GUI: UIMachineLogicNormal::sltCheckForRequestedVisualStateType: Requested-state=0, Machine-state=5

00:01:39.258677 GUI: UISession::sltAdditionsChange: GA state really changed, notifying listeners.

00:01:39.258757 GUI: UIMachineViewNormal::adjustGuestScreenSize: Adjust guest-screen size if necessary.

00:01:39.258800 GUI: UISession::sltAdditionsChange: GA state change event came, notifying listeners.

00:01:39.258836 GUI: UIMachineLogicNormal::sltCheckForRequestedVisualStateType: Requested-state=0, Machine-state=5

[#2 · Accepted solution]

I will reply myself, as the support here is the most terrible I've seen in years. 

The problem was a memory one on my laptop: since I had reserved 5GB with a 8GB memory, it simply stopped loading when I have 4GB already occupied. 

The steps I took anyway which may have somewhat made the trick are:
-reinstalled cloudera quickstart 5.5 and then mounted the VHD

-stopped some services from starting (the ones I don't use: Impala, Hive, Oozie)

-waited. A lot.

[#3]

I am sorry that you did not receive assistance in a timely manner @Vale. The Cloudera Community is a peer to peer forum so there is a chance of a post going unanswered. Cloudera employees do help out in their spare time as well but it is not their primary function. For users who are not currently support customers and wish to receive assistance from Cloudera via the community, there is the Cloudera Developer program as an option. 

Best of luck with your project. 

[#4]

All I had to do was wait about 15 minutes for the start-up process to complete.