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Some old HPs used to use the pressing the [F1] or [ESC] key to access the BIOS instead of the "normal" keys most use today. If a logo/splash screen pops up on booting just press [ESC] key and it'll usually clear the splash screen "image" and show you the post info behind it.
If it's still not popping up at bootup, you could try turning the machine off and pulling the CMOS battery out of the mobo, wait 10mins (Yep, 10mins really. It's to clear the mobos capacitors completely of power.), and popping it back in to reset the CMOS to default. If the BIOS is passworded you can use one of various DOS tools available like KILLCMOS (DOS only tool; so stick it on a USB stick or floppy etc) to clear/reset it to factory defaults. Finally, and probably easiest, is to just move the jumpers on the mobo located near the CMOS battery to either CLEAR CMOS, CLEAR, CLR, JCMOS1, PASSWORD, PSWD (or something similar to that depending on your mobo, check positions on manufacturer's site) positions to reset/clear CMOS and reset BIOS to default.
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