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Your operating system is corrupted in worst possible way. Best thing for you to do right now is to hook up your hard drive as a slave in another working computer, take off of it and save the files you want, and then take the original drive and reload it using the restore disks that came with your computer. Then re install the files you saved.
When you replace a motherboard, all of the drivers for the many devices that are on the motherboard need to be re-installed from disk, or another storage media type. Get the drivers for the motherboard on a USB stick and connect it to the mother board. reboot and when it asks the disk with drivers, tell it the drive letter of the USB stick.
The system is not recognizing your hard drive- Here's how you can see if you need to call Sony/Geeksquad. Check if you have any USB drives in your system- if so, remove them. Try rebooting. If that works- the issue was your system was trying to boot off of the thumb drive. If it doesn't work- try and see if there is a drive sticking out from your laptop- usually on the right side, and towards the bottom- slide it in if so. If not- your hard drive may have failed, or the motherboard controller for your hard drive has failed. Contact the people that have your system in warranty- if it is not in warranty, you can purchase a replacement drive to see if the issue was just the drive itself. Unfortunately, if it is the motherboard, and you are out of warranty- you may rather purchase a new laptop. Laptop motherboard replacements generally run in the 300+ range- I've known Dell to charge 500-900 for their out of warranty repairs.
Usually that is drive related not the motherboard. The drive may be slow to boot and the motherboard times out waiting for it. By the time you reboot the drive is running or spun up enough to get past this.
To confirm you can try the drive in a differant computer as a secondary and then run scans and any stress test software. You may find the drive is failing or about to.
Harddrive jumper is not figured correctly (in case of IDE PATA) or it may have malfunctioned.
Disconnect the PC from the mains supply, remove the cover on the system and check for any loose cable connections of hard drive. Check inside the BIOS whether the drive is listed and as the first boot device in Boot Order tab.
Note: During inspection take care to avoid touching any board component unnecessarily. Also avoid using force.
try reseating the dvd drive and then go into the BIOS to be sure that the drive is being recognized. Actually go into the area of the BIOS that shows the name of the dvd drive that it recognizes.
It it does recognize the dvd drive properly then try other boot cd's. It still may not recognize them.
If so try another known good dvd drive in the laptop and if you have the same problem then take out the hard drive and then see if the system will boot up off of the dvd drive then. If it still doesn't boot then the motherboard is bad.
If it does boot then that means the new hard drive is bad and shorting out the dvd drive controller on the motherboard and the hard drive would need to be replaced.
Hope this helps clear up things for you and sorry for not responding sooner.
Try Checking if your motherboards bios will recognize the hard drive. If not, Then the hard drive is probably damaged.
To access The bios, Most Motherboards open the bios when you press the delete key
If you have two or more hard drives then the settings of the jumpers eg. Slave,Master,Cable Select.
Because they might be conflicting with each other.
I had the same problem, But I tried installing XP Home edition on my secondary hard drive and it works.
But i need to insert my xp home install disc to get it the bios to recognize that windows is installed otherwise it goes " insert system disk and press enter"