|jefro's reference is not ideal. |
The last part of jam's info is about if you wanted to install or re-install XP on a SATA hard drive by booting the computer from an XP CD.
You should make sure the bios settings are correct before you do that.
- If the bios does not detect a bootable partition after you have removed the battery or cleared the cmos, if the Boot Order or similar settings have a CD drive or similar listed before any hard drive, the bios will automatically boot from the XP CD, if it's in a drive the bios can boot from (if you have more than one optical drive, see below) , but you need to determine why the bios is not detecting a bootable partition when it was before. See below.
- if the bios DOES detect a bootable partition after you have removed the battery or cleared the cmos, if the Boot Order or similar settings have a CD drive or similar listed before any hard drive, if the bios can boot from the disk (if you have more than one optical drive, see below) , you will see a line while booting "Press any key to boot from CD" or similar - press the specified key to boot from the XP CD while that line is on the screen.
- if the Boot Order or similar settings DO NOT have a CD drive or similar listed before any hard drive, you can't boot from the XP CD until it DOES have the Boot Order or similar settings set so you have a CD drive or similar listed before any hard drive.
If that setting is not correct...
If the bios does NOT detect a bootable partition after you have removed the battery or cleared the cmos, you will get an "operating system not found" or similar error. See below.
If the bios DOES detect a bootable partition after you have removed the battery or cleared the cmos, the bios will boot the hard drive partition.
When you remove the mboard battery, then re-install it, or move the clear cmos jumper on the mboard and move it back, the cmos is cleared of user settings, AND the time and date are also set to defaults.
You will get the Cmos Checksum error or similar when you boot after that.
You have to enter the bios Setup and set at least the current Date and Time (or any date and time other than defaults) , Save bios settings, in order to get rid of the Cmos Checksum error or similar when you boot after that.
If you still get the Cmos Checksum error or similar when you boot after that......
- when you re-install the mboard battery, it's polarity must be correct. Usually it's in a socket that's flat to the mboard surface, and the + must be on the top where you can see it when the battery is installed. If it's in a vertical socket, you must be able to see the + when it's installed.
- the contact in the socket that touches the top of the battery must touch it - if that's bent upwards or otherwise doesn't touch it, remove the battery, bend that contact so it will touch the battery when it's installed.
Since everything is set to defaults when you remove the battery or clear the cmos, that sometimes causes problems when the bootable partition on the default drive the bios is trying to boot from is not bootable = does not have an operating system on it.
If you have only the one hard drive, connect it to SATA 1 or similar, and...
Check your SATA data cables. The connector on each end should "latch" into the socket on the drive and on the mboard, or on the drive controller card - it should not move when you merely brush your hand against it near the socket - if it does, mere vibration can cause a poor connection of it - use another SATA data cable that does "latch", or tape the connector in place.
(There is a slight projection or bump on one side of the outside of the connector that "latches" it into the socket - it's easily broken off or damaged)
The same thing applies for the SATA power connection.
- If you have two hard drives, one IDE, the other SATA, the default is either
- the bios attempts to boot from the IDE hard drive first,
- or from the SATA first,
depending on the bios default.
If the hard drive it attempts to boot from is NOT bootable, the bios will NOT attempt to boot from another hard drive.
- if you have two hard drives, both SATA, or both IDE, one has a partition with an operating system installed on it, the other does not, the bios by default will attempt to boot from the first hard drive it detects, according to the way the drive is connected to which data cable header on the mboard.
E.g. if the drive you boot from is connected to SATA 2, the drive that has no operating system to SATA 1, the bios will attempt to boot from the drive connected to SATA 1. If the hard drive it attempts to boot from is NOT bootable, the bios will NOT attempt to boot from another hard drive.
In both cases, if the bios does not find a bootable drive, you must go into the bios Setup and find the list of hard drives, and make the one you want to boot from the first one in the list, Save bios settings.
Usually they are listed by the model number the bios detects, but they may be listed as HDD0, HDD1, etc., or similar. .
Usually that list is near the Boot Order or similar settings. Sometimes you can list more than one hard drive in the Boot Order or similar settings.
In order to be able boot from a bootable optical disk, a CD drive or similar must be listed before any hard drive in the Boot Order or similar settings in the bios. Some bioses have the settings that way by default, others do not. It does not necessary have to be first in the list. E.g. if you have a floppy drive connected, that should be listed first.
However, network boot or similar should be listed AFTER all hard drives, in most cases, unless you need to boot from a company or institutional network.
If you have more than one optical (CD or DVD) drive, many bioses will only attempt to boot from a bootable disk in ONE of them. In that case, insert the disk in another drive, try again, or go into the bios and find the list of optical drives - the drive you want to boot a bootable disk from must be made the first one in the list, Save bios settings.