Well, there's a way around that, too - at least on some mobos. I just checked my mobo manual to be sure.
ALL mobos have a procedure for completely resetting the BIOS. On mine, at least, when you do this you reset its password to nothing, too, so there is no password. If yours works this way, you can do this to get into BIOS. The only problem is that you MAY have to change a few things in there to suit what you have, but you can't look at the current settings first so they can be restored later. We'll just have to trust that the default settings are right.
On the mobo there will be a BIOS backup battery. It is about the diameter of a quarter and quite flat, mounted in a plastic circular holder. Very near there should be a little set of three pins marked something like "CLRTC" (for Clear Real-Time Clock), or "Clear BIOS" or something similar, and there will be a jumper on two pins. The process is to remove the battery, move the jumper, move it back, re-install the battery, then boot immediately into BIOS and restore its default settings. Here we go:
1. Shut down, disconnect the power cable and open the case. Locate the battery and reset jumper pins. Remove the battery from its holder, noting which way it goes back in.
2. Move the jumper from its pair of pins to the other side. Leave it there for 10 to 15 seconds, then restore it to its original location. (The part of the BIOS system that stores user settings must have power at all times to retain its information. It has a backup battery for when power is off that will keep it alive for a couple of years. This procedure deliberately removes that battery and discharges any capacitor that is helping, so the BIOS memory section gets NO power and loses its data.)
3. Re-install the battery. Close up the case and connect the power cord.
4. Turn on power and boot into BIOS Setup. It should NOT ask you for a Password this time. (When the BIOS starts up and its first checks disclose that it has no user settings in its memory, it will try to restore a factory default set of parameters. Sometimes these are OK, sometimes not completely.)
5. Look on the last menu screen (it may be the exit screen) for an option to Load BIOS Defaults. You may have only one choice, or there may be a few sets of "default" settings. IF there's a choice, choose the Optimized Defaults, and they will be installed. This makes SURE that the BIOS gets a complete set of reliable settings after being Reset. Save and Exit. The machine will try to boot, but don't let it - push your front panel Reset button to force a complete reboot. AGAIN, go immediately into BIOS Setup.
6. IF you believe there are BIOS settings you must change, do that now. In particular, you should verify that your HDD's are all detected correctly and then set your Boot Priority Sequence as I posted before. Any other changes you are sure are needed, make them. Then Save and Exit once again, but this time let it complete its boot process. It OUGHT to boot from your original SATA HDD if you set it that way.