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When booting, try going to the Boot Menu by pressing F12 when you see the Toshiba logo so you can select your hard drive as your boot device. After doing so, if you still get an "Invalid System Disc" error, then your hard drive may be shot.
Windows is not starting. Try to start in safe mode and if you can, do a system restore back to when it was working. If you can't do this, then you'll need to insert the system disk and boot from it and choose the option to repair your computer. I suspect that you have corrupt Windows files or a corrupt registry. Repairing it with the system disk should solve the problem. Either that, or you will have to do a reinstallation.
1) Go into your bios by pressing the Delete key.
2) Navigate to boot disk priority.
3) Set this to Primary master disk drive (The drive that your operating system is installed on.
4) The save and exit.
This should stop the message from coming up and solve your problem.
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For that when you power up the computer press F8 key then if you are
able to see safe mode and other menu then enter in enable vga mode. Then go to start menu then control panel ->dispaly ->settings. Also make sure that graphic driver installed and working fine. change screen resolution to 1024*768 then apply and ok. then check in normally. But if you are not able to see even safe mode then you need recovery disk or windows disk. Boot computer with that disk. For that when you power up the computer press F1 or F2 or "del" key to enter in bios . Then go to boot menu then set first boot device as cd/dvd rom .then save and exit. Thern it boot with disk. Then follow the procedure and repair your previous windows. Let me kno wif you need further assistance.
Requested data was not in memory. An invalid system memory address was referenced. Defective memory (including main memory, L2 RAM cache, video RAM) or incompatible software (including remote control and antivirus software) might cause this Stop message, as may other hardware problems. What you can do is if you have more than one memory modules, you can boot the system with single and see. If this is due to memory leakage issue, you can find it here
if you go into safe mode (F8) on boot-up, does the graphics show up?? If so, it's the graphics board/chip on the MB. I have one and have the same problem - no amount of loading drivers, re-install BIOS, etc. would help. sometimes it works, but most times when you start up, shows the Toshiba logo, and once windows starts, goes to a black screen.
The CMOS error is caused by a dead motherboard battery. There is a small battery on the motherboard Usually a 2032 battery. The dead motherboard battery could also cause the Invalid system disk because a dead motherboard battery will also cause the motherboard to lose the Hard drive settings.
Go into the POST and set it back to the default setting.
Reboot and see if the cd/dvd rom drive.
If it still does not recognize the drive, then try using a different IDE cable.
Question, did the MB work fine and all of a sudden it does not regonize the drive?
By the way, I have the same MB. So far I have not encounter any problems with it.