As far as I know, the HP Pavilion A6437C uses a Foxconn MCP73M01H1 motherboard. This uses an Award BIOS. Unfortunately I can find no documentation that mentions a 4 beep code with an Award BIOS.
What you could try is to unplug the power to the computer, and then remove the CMOS battery from the motherboard. Leave it for an hour or so and WITH NO POWER ATTACHED press the power on switch and hold it in for about 30 seconds. There may also be a jumper to clear the CMOS settings. You could try resetting it by (with the power unplugged) move the jumper across and then move it back again.
Hopefully when you power up again the BIOS message will be no more.
Please let me know how you get on.