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Re: when i turn it on it says missing operating system??
1) you may check your laptop back cover there is a microsoft windows lable with CDkey, if so you may find any OEM windows disk to do installation.
2) can not find the lable, you need find a computer company to do a OEM installation more cheaper.
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It seems you have what's known ksod black screen of de ath instead of blue screen of dea th.google this.i had this happen after install an update from Microsoft for windows 7. My cure was to get hold of a hirens boot disc which is also for USB drive which installs a small Xp operating system to your available ram and allows you to fix or reinstall windows .it may be a root kit virus.consider a dual boot system so you can always get access by partitioning some of the hard drive.my favourite bit kit is a small file called ERDNT which saves a working copy of your registry each day so an event like this you just go into safe mode and pick the day before and voila.no files get lost that way .and way better than system restore which these idiots always try to corrupt with virus attacks.
"Unmountable boot volume" this problem is your hard disk partition which is failure to recognize & identify the operating system running on the hard disk. Reformat your hard disk and put another operating system to run again your computer.
Must be driver related... Have you tryed booting in Safe Mode? To do so, reboot your computer after BIOS has shown and the Operating System is about to boot press F8... If it loads then, reinstall your Graphics driver. Good luck. -Tom.
your computer might be looking for the operating system on your usb,try to disconnect the battery and ac adapater and put it back again,reboot he computer,if problem persist,you might need to go to the bios or setup screen,usually you can go there either by F2 or delete when you turn it on,go to the boot order/boot sequence and make sure that your hard drive is on the number one list,otherwise,you need to change the order so it wont read the usb before it loads windows