there is a probem when starting the boot menu and the system says check system then press F1 key, after i press the key absoluetly nothing happens. what should you suggest.

Try to enter the system BIOS at startup, save the current settings and reboot. If the problem persists, your CMOS battery may be empty and must be changed.

If you HAVE just flashed the bios, there is probably something else after the Cmos Checksum Error or similar message - something about the BOOT BLOCK. In that case, the flash failed, and the laptop cannot boot normally. You MAY be able to recover from that situation by following a specific recovery procedure. ...... If you have NOT just flashed the bios, the cmos battery is too weak or it is dead. However you should still be able to use the computer, if the main battery is charged up enough. Your computer may not boot at all or will not boot all the way if the main battery is not installed, or if it isn't charged beyond a minimal level. If it's really old it's likely to be defective - sometimes internally shorted or it has an open connection. If it's internally shorted it will probably get HOT after you have tried to charge it for a while, rather than just warm. If it has an open connection, it will never get warm when you try to charge it for a while. If you have a volt meter or can borrow one , measure it's voltage. "OS: windows 95 Product: Toshiba Toshiba satellite 100cs " Probably an old laptop If this computer has been sitting unused for a long while, the cmos battery on some laptops is rechargable, it's probably discharged, and it's likely the main battery is discharged to the point the laptop won't fully boot. If you just leave the laptop plugged into it's AC adapter for a while, at least a few hours, with the laptop off, if the cmos battery is rechargable it may then be charged up, and the main battery may then be charged up enough for the computer to start up properly. You'll still get the Cmos Checksum Error or similar message when you boot the next time - you simply go into the bios Setup and set the date and time, save settings, then if nothing else is wrong the hard drive will load it's software. If the cmos is rechargable one, - if it has charged okay you will not get the Cmos Checksum Error or similar message when you boot after that. - if it has NOT charged okay you WILL get the Cmos Checksum Error or similar message every time you boot the computer after the computer has been shut down. - if the cmos batterry is NOT a re-chargable one, you WILL get the Cmos Checksum Error or similar message every time you boot the computer after the computer has been shut down. Non rechargable Cmos batteries typically last about 5 years. Rechargable ones may last longer than that, or NOT.

I got the same error when I put a hard drive inside a different computer than tried to put it back in its original computer. I messed with it for about 2 hours and then decided to reinstall windows xp and that worked. Of course that probably would fix almost any non-hardware issue on a computer.