Orange light and overheating

[Oregonlady]

All right, I'm new here, but my HP desktop Pavilion A6560 is new, too, and today on being turned on, the tower had an orange light next to its usual blue "on" light, with "no signal" going on the monitor as it seemed to try three times to boot up successfuly. When it did, finally, the orange light flickered for awhile, slowly eased off. Is this an overheating issue? Vista's "Advisor" program meanwhile is saying it's "critical" I make some systems recovery disks--which it only lets one do once--but doesn't say how many CDs this would require; does anyone know? Seems a good idea, if the orange light is a danger sign. It has been hot around here today--90 degrees out, maybe 80 in the home-office room--but sounds from the people onboard here that that wouldn't be causing the problem. Please help; HP's tech people didn't seem to understand. I 'm hoping the orange light is not a motherboard-out signal like the red light on my previous HP, which died.