When you first boot the pc you will generally get either a screen with the mobo manufacturers info/specs, or a pre-start checklist type of thing.
To go into the BIOS one generally taps the delete key on the keyboard immediately after hitting the power button.
crunchie
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i thing if the bios is set to quick boot it will not show all the boot screen info ,you can disable the quick/fast boot in the bios or ,most older board will show it if you hit the tab key at some point on bootup
caperjack
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the missing cmos battery could stop it from booting, and with no ram it will likely just beeeeeeeeeeeeeeeeeeeeeppppppppppppppppppppppp.
caperjack
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i have seen older much older computer not boot because of a dead battery ,but i guess you don't really nee battery in to get boot screen .you would not need the hdd installed ,you should be getting boot screen now if the motherboard was working ,with the keyboard plugged in do the lights on the keyboard flash when you turn the computer on
caperjack
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HDD is not necessary, but some RAM would be. Wouldn't hurt to also go get a $10 battery in order to save the cmos settings.
crunchie
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