my laptop is saying operating system not found

My sony vaio model pcg-8112l will not boot and says operating system not found.  I looking solutions on line they all say to press the assist button.  I do not have or do not know where to find an assist button.  Help
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JohnBusiness Consultant (Owner)Commented:
Try booting from a bootable DVD (Say Ultimate Boot CD or Knoppix). Does the computer start this way?  If you use Ultimate Boot CD, try looking at the hard drive. Do you see it and the files?

It appears the hard drive has a problem of some sort and the Sony BIOS cannot see it.

Please let us know.

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Mal OsborneAlpha GeekCommented:
First, obvious thing to check: Do you have any removable storage devices plugged in?  Sometimes a laptop will attempt to boot from a USB smartphone, or SD card.
Thomas GrassiSystems AdministratorCommented:
Have you booted up into the system settings?

Run diags

Check to see if the system sees the hard drive

As John says sounds like your hard drive is on the way out.

switch the laptop off and on again. press del and/or f2 key to enter into bios. try to find out the boot order. make sure that your hard disk is first before dvd rom and before usb and before network.

if hard disk already is first but the loader couldn't be found nevertheless, there are two reasons which you may check. one is that the hard disk can't be recognized at all. if so, you shouldn't be able to find the hard disk in the bios at all or it is not correctly named. check the connections and cables if so. a second reason might be that the disk is corrupted by malware. try to boot from an usb and use antivirus to validate the disk.

Mal OsborneAlpha GeekCommented:
Bit hard to tell with no user feedback, but these suggestions all look good.
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