1 short beep when displaying logo = No error during POST
Long Beeps in an endless loop = NO DRAM installed or detected
*1 long beep followed by 3 short beeps = Video card not found or video card memory bad*
High frequency beeps when system is working = CPU overheated; System running at lower frequency
You need to hit DELETE key on boot up in order to determine the identity of your BIOS so we can be sure which beep codes are appropriate to you motherboard's BIOS - as you can see they do actually mean something.
You may wish to check further by shutting down your system and powering up a number of times, to find if you are still getting what looks to be a reportage that your video card is perhaps seated wrongly in the AGP slot, is overheated (maybe intermittant fan failure) or that ideed its memory is failing. May just be best to report it to your vendor anyway - best to be on the safe side and they will advise you of their concerns - they'll probably just say "see how it goes"...
Do have a little look inside to see the video card though (take antistatic precautions) and with machine switched off, maybe refit the card back into the AGP slot - don't do this if you have any concerns that it'll invalidate warranty or you don;t feel comfortable doing so - your shop should look after it.
Those temperatures look very good...