My PC won't boot up?

Question

about a month ago i was using my computer as normal,i think i was on you-tube or something when it just rebooted its self which i thought was strange at the time. this happened once or twice more but the last time it did it goes to reboot for about 5sec then nothing happens.would be grateful of any help

Answer 1

you havnt opened the case and taken anythink off and put it back?? if you have i would look there to begin with, CPU heatsink could have not been put back on proporly and overheat cut out on mobo kicking in.

dose anythink come on screen?? are there any beeps?? need more info!!

EDIT_

this sounds like a power supply issue, check the cables, disconnect anythink you dont really need to be connected. especially IPOD or MP3 players.

take all connections off from the back except for Keyboard, Mouse monitor and Power cable. then boot and see if it works.

Answer 2

Try reformatting your computer but save the stuff to disk you wanna keep like: pictures, music ect.

Answer 3

if ur running on xp or vista...at start up hit F8 key..you wud get options to boot to safemode..boot to safemode n perform system restore

Answer 4

Before attempting this, you may want to put your drive into another pc if there is one available and copy any folders or files that you would not be happy to lose. This should be possible as it is probably the boot partition or master boot record or some other system file that is corrupted.

Here’s what to do. Boot from your windows disc and choose Recovery Console when the Welcome to Setup screen appears (Press R to Repair the installation using the Recovery Console.) (Not the repair option on the installation/setup options screen).

If you do not have a standard US keyboard setup, e.g.  You are in the UK with a UK setup, watch the grey strip at the bottom of the screen when the recovery console begins to load, which will ask you to press F5 (I think) and choose your keyboard language. If you don’t do this, your admin password, particularly if it contains non-alphanumerical characters may not be recognised. You will be taken to a black screen, which will ask which operating you wish to log in to. If you only have one, press ‘1’ and enter. If you have more than one, choose the operating system you wish log into and type in the appropriate number, followed by enter.

You will then be asked for the administrator password. If you do not have one press enter. If you do type it in and press enter.

You will be taken to a command prompt. Type in ‘chkdsk /r’ without the quotes. Note there is a space between the K and the forward slash. If you get the error message ‘Autochk.exe cannot be found’ or some other error in relation to a missing ‘autochk.exe’ file, then do the following at command prompt:

Type:CD C:\WINDOWS\SYSTEM32

Now try the ‘CHKDSK /r’ command again.

This may take quite some time. It will check the disk and file system for errors and try to repair them.

You will get a report at the end telling you if errors were found and if they were fixed-.

Sometimes you get a message saying the chkdsk could not run because the disc contains unrecoverable errors or something similar.

The next step is to reboot. If chkdsk ran and corrected your errors, you may well be able to boot back into your o/s.

If chkdsk was not successful and you still cannot boot or could not run chkdsk the next step is the same.

Follow the instructions above and go back into recovery console.

This time at the command prompt type ‘fixboot’, again without the quotes and enter.

You may get a message along the lines of are you sure; this may make your data unrecoverable. You have to make that decision. I personally have never known this happen, and my philosophical view is my data is currently unreadable (note: not unrecoverable) and I am prepared to take the chance. Are you?

Then you have two choices. Reboot to see if this works.  If it does, all well and good. If not, or if you choose not to reboot (not critical, but not recommended), at the command prompt in recovery console type ‘fixmbr’, again without the quotes. You may get a similar warning to the ‘fixboot’ command. My advice is the same, but you much choose whether to take the risk or not. Restart.

Hopefully you will now have access to your pc and files.

These are the steps I take when encountering this and similar problems. I have found them to be 99.9% effective- in other words, they only failed me once and in that situation I believe the hard drive to have been defective and replaced it.

Without warranty, at your own risk. Some sources below so you can make an informed decision.

Answer 5

When you power on your computer, tap the F8 key. Once your on the boot menu, scroll (using the arrow keys) down to the line which reads "boot with the latest known good configuration".

Another way....

When you computer is at the boot screen, tap the F2 key which will take you into the computer setup. At this screen you wil be able to disable "BIOS".

Once you have done this, save you changes, then re-boot your pc normally again.

Hope this helps.

Best regards,

Nick~