During boot process windows screen appears and then all goes blank

Sometimes when i switch on my laptop it displays the windows screen and then all goes blank. the hard drive light also stops flickering.
I have to switch on again. this can happen 2-3 times and then the laptop will start normally. No scan disk or error messages are displayed.
Also, even after i have logged on the screen goes blank and the system stops working altogether. i have to manually switch off and on again. Again, no scan disk or error message is displayed. i have run Toshiba diagnostics and all seems to be functioning well according to it.

Hi dude
Firstly it would be very nice to know what notebook model you have. Such info is mostly appreciated.
My first thought was a hardware malfunction. Maybe a something wrong with HDD. But in my opinion you should firstly check if the same would happen after OS recovery.
Try to recover the notebook with the delivered Toshiba recovery CD and check the notebook functionality after this procedure.
See you later ;)

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I'm very frustrated. I was using my laptop and suddenly the rainbow wheel appears and it freezes. I tried to hard reboot it and when it restarted a grey screen appears and the apple logo shows up. I bought it used from a Micro Center and I believe it's out of warranty. What is going on and what are my options?

Take each of these steps that you haven't already tried. Stop when the problem is resolved.
Step 1
The first step in dealing with a boot failure is to secure your data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since your last backup, you can skip this step.
There are several ways to back up a Mac that is unable to boot. You need an external hard drive to hold the backup data.
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b. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, boot the non-working Mac in target disk mode. Use the working Mac to copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
c. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.
Step 2
Sometimes a boot failure can be resolved by resetting the NVRAM.
Step 3
Press and hold the power button until the power shuts off. Disconnect all wired peripherals except those needed to boot, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can boot now, one of the devices you disconnected, or a combination of them, is causing the problem. Finding out which one is a process of elimination.
If you've booted from an external storage device, make sure that your internal boot volume is selected in the Startup Disk pane of System Preferences.
Step 4
Boot in safe mode. Note: If FileVault is enabled on some models, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Post for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
When you boot in safe mode, it's normal to see a dark gray progress bar on a light gray background. If the progress bar gets stuck for more than a few minutes, or if the system shuts down automatically while the progress bar is displayed, your boot volume is corrupt and the drive is probably malfunctioning. In that case, go to Step 5.
If you can boot and log in now, empty the Trash, and then open the Finder Info window on your boot volume ("Macintosh HD," unless you gave it a different name.) Check that you have at least 9 GB of available space, as shown in the window. If you don't, copy as many files as necessary to another volume (not another folder on the same volume) and delete the originals. Deletion isn't complete until you empty the Trash again. Do this until the available space is more than 9 GB. Then reboot as usual (i.e., not in safe mode.)
If the boot process hangs again, the problem is likely caused by a third-party system modification that you installed. Post for further instructions.
Step 5
Launch Disk Utility in Recovery mode (see Step 1.) Select your startup volume, then run Repair Disk. If any problems are found, repeat until clear. If Disk Utility reports that the volume can't be repaired, the drive has malfunctioned and should be replaced. You might choose to tolerate one such malfunction in the life of the drive. In that case, erase the volume and restore from a backup. If the same thing ever happens again, replace the drive immediately.
This is one of the rare situations in which you should also run Repair Permissions, ignoring the false warnings it may produce. Look for the line "Permissions repair complete" at the end of the output. Then reboot as usual.
Step 6
Reinstall the OS. If your Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
Step 7
Repeat Step 6, but this time erase the boot volume in Disk Utility before installing. The system should automatically reboot into the Setup Assistant. Follow the prompts to transfer your data from a Time Machine or other backup.
Step 8
This step applies only to older Macs (not current models) that have a logic-board ("PRAM") battery. Both desktop and portable Macs used to have such a battery. The logic-board battery is separate from the main battery of a portable. A dead logic-board battery can cause a boot failure. Typically the boot failure will be preceded by loss of the startup disk and system clock settings. See the user manual for replacement instructions. You may have to take the machine to a service provider to have the battery replaced.
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If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store to have the machine tested. If you can't get to an Apple Store, go to another authorized service provider.

15" i7 Macbook Pro from early 2011.takes the mac laptop two or three tries to boot successfully. It would turn on, show gray screen, shut down, turn on again, show gray screen, shutdown, and then turn on, show gray screen, before it can finally get

Hello All,
I have a 15" i7 Macbook Pro from early 2011. The past few weeks, it has been getting increasingly difficult to get on my computer. It takes the mac laptop two or three tries to boot successfully. It would turn on, show gray screen, shut down, turn on again, show gray screen, shutdown, and then turn on, show gray screen, before it can finally get to the dark gray log-in screen. Even when I finally get logged in to start working, thinking it would be okay now, it shuts down randomly.
I've ruled out the possibility of a software problem because I've just done a clean re-install of Mac OS X Mavericks on my computer just yesterday.
I did upgrade the RAM recently, about a month and a half ago, from 4GB to 16GB, I went to the apple store four days after that upgrade to have them do a hardware test, and clean the inside of my laptop, which helped with previous heat issues. When they did the hardware test, the hardware was all registered as fine from their system.
I've tried resetting the SMC, PRAM, and doing the internet recovery hardware test, but to no avail. I thought I could at least find out what parts needed to be replaced from the hardware test but it seems that when the hardware test is almost finished, the computer just shuts down, So I am unable to see the results.
My computer is also having battery issues, under battery condition, it says "replace now," parts have been ordered, waiting for arrival. But if the battery health is low, it should still boot up fine, it would just hold a significantly less charge.
Could this be a hard drive issue?
Has anyone had similar symptoms and how was it resolved?
Does anyone know what I can do to alleviate this issue?
I haven't had time to take it to Apple because I'm currently taking a 21 credit semester academically. I'm an art and design student so my computer is basically the bane of my existence. Help! Any constructive advice is welcomed!
Thank you so much for your input!
-Christina C.

Problem description:
The Hard Disk is failing.
EtreCheck version: 2.0.11 (98)
Report generated November 4, 2014 at 7:59:28 AM EST
Hardware Information: ℹ️
MacBook Pro (15-inch, Early 2011) (Verified)
MacBook Pro - model: MacBookPro8,2
1 2.2 GHz Intel Core i7 CPU: 4-core
16 GB RAM Upgradeable
BANK 0/DIMM0
8 GB DDR3 1600 MHz ok
BANK 1/DIMM0
8 GB DDR3 1600 MHz ok
Bluetooth: Old - Handoff/Airdrop2 not supported
Wireless: en1: 802.11 a/b/g/n
Video Information: ℹ️
Intel HD Graphics 3000 - VRAM: 512 MB
Color LCD 1440 x 900
AMD Radeon HD 6750M - VRAM: 1024 MB
System Software: ℹ️
OS X 10.9.5 (13F34) - Uptime: 0:3:43
Disk Information: ℹ️
TOSHIBA MK7559GSXF disk0 : (750.16 GB)
S.M.A.R.T. Status: Verified
EFI (disk0s1) <not mounted> : 210 MB
HDV4 (disk0s2) / [Startup]: 749.30 GB (712.10 GB free)
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
MATSHITADVD-R   UJ-898
USB Information: ℹ️
Apple Inc. FaceTime HD Camera (Built-in)
Apple Inc. BRCM2070 Hub
Apple Inc. Bluetooth USB Host Controller
Apple Inc. Apple Internal Keyboard / Trackpad
Apple Computer, Inc. IR Receiver
Thunderbolt Information: ℹ️
Apple Inc. thunderbolt_bus
Gatekeeper: ℹ️
Mac App Store and identified developers
Kernel Extensions: ℹ️
/Library/Application Support/Avast/components/fileshield/unsigned
[loaded] com.avast.AvastFileShield (2.1.0 - SDK 10.9) Support
/Library/Application Support/Avast/components/proxy/unsigned
[loaded] com.avast.PacketForwarder (1.4 - SDK 10.9) Support
Launch Agents: ℹ️
[not loaded] com.adobe.AAM.Updater-1.0.plist Support
[loaded] com.avast.userinit.plist Support
Launch Daemons: ℹ️
[invalid?] com.adobe.SwitchBoard.plist Support
[loaded] com.avast.init.plist Support
[loaded] com.avast.uninstall.plist Support
[loaded] com.avast.update.plist Support
[invalid?] com.perion.searchprotectd.plist Support
User Launch Agents: ℹ️
[invalid?] com.avast.home.userinit.plist Support
[loaded] com.google.keystone.agent.plist Support
[invalid?] com.jdibackup.ZipCloud.autostart.plist Support
User Login Items: ℹ️
None
Internet Plug-ins: ℹ️
AdobePDFViewer: Version: 10.1.1 Support
QuickTime Plugin: Version: 7.7.3
JavaAppletPlugin: Version: 14.9.0 - SDK 10.7 Check version
Default Browser: Version: 537 - SDK 10.9
User Internet Plug-ins: ℹ️
TroviNPAPIPlugin: Version: 1.0 - SDK 10.9 Support
Google Earth Web Plug-in: Version: Unknown
Safari Extensions: ℹ️
Avast Online Security
Trovi Search for Safari
3rd Party Preference Panes: ℹ️
None
Time Machine: ℹ️
Time Machine not configured!
Top Processes by CPU: ℹ️
      16% mds
      7% WindowServer
      1% loginwindow
      1% fontd
      1% com.avast.daemon
Top Processes by Memory: ℹ️
120 MB com.avast.daemon
86 MB Google Chrome
52 MB Finder
52 MB WindowServer
41 MB Google Chrome Helper
Virtual Memory Information: ℹ️
13.45 GB Free RAM
1.34 GB Active RAM
944 MB Inactive RAM
1.43 GB Wired RAM
1.11 GB Page-ins
0 B Page-outs

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