GA-P35-DS3R boot recycle

Hi it seems I have the same problem as many of you here and I'm hoping there's a fix.

Anyway this is a new build that was working and booting fine without any problems for the last 2 days. No over-clocking had been done and the only changes to the bios was to get raid going. No idea what could have caused this nothing has changed since the previous two days before.

Now what happens is it enters the boot recycle issue and i get about .5 of a second of fan spinning and misc leds and then recycles. I have tried removing everything and replacing it one by one, curiously if I remove the ATX_12V connector from above the CPU the system will power up but not post and stay like this until i remove the power. This would suggest to me that there might be a short circuit somewhere on the board, I've looked everywhere though. I don't think its the PSU not being powerful enough either as the boot recycle occurs just the same whether or not the GPU is powered or not except that when it is not powered there is a long beep from the speaker.

Heres my system:
PSU: Coolermaster 550v
CPU: Intel Q6600
MoBo: GA-P35-DS3R, unsure what firmware version but I haven't upgraded since I bought it on the 29/2
RAM: 3 GB Kingston DDR2 6400
GPU: Gigabyte 8800 GTS 512
HDD: 2 Seagate 320GB SATA drives running in RAID 0 array
DVD: Pioneer SATA DVD writer

PS. its was running Vista Home Premium fine until late yesterday evening when it must have gone into standby mode or something because it wasn't shut down, since then it has boot recycled and has not yet successfully booted since the problem started.

PPS. I have now removed all the drives left the memory and GPU and reset the bios by removing the battery and now it will post but now it will get past the manufacturer splash screen and gets to the dual bios screen where it says:
Warning: BACKUP BIOS CHECKSUM ERROR!
BIOS Image Recovering ................

It wont get past this point and keeps recycling, so how can i flash the bios without being able to enter the boot menu?

Also you think it might be a short circuit? If there is a short circuit, then you must have done something to cause the short circuit because they just don't happen for no reason. I am guessing that it isn't short circuit but it must have sarted to not work when you trying to raid the hard drives

Have you tryed 1 stick of ram ? try this 1 stick in all the slots of coarse it needs to be a known good ram also the gpu I think this board has a secondary 12v power on the motherboard for use when running 2 PCI E for added power + the one to the card, have you had this conected ?? 550 seems a bit low, 350 for the card 125 for the cpu + everything eles worth a check if you have a spare around could have gone bad..


just some thoughts here whil I am at work hope you get it working

I have the DS4 and had the same problem. The clock I had was very stable yet cold boot would reset bios every time.

Now as it happends I cant even set my fsb to stock 266mhz, it wont post, just a cycle of resets.

When it does boot it has to all be on auto otherwise I get no boot.

With my DS4 board iv found out that when I overclock even slightly It would not post at all. This I found to be having a external USB drive delaying the post boot, thus causing it to resset the bios. This was because the USB drive was just starting to spin up during the post. I noticed that the memory bios test would pause for a second, this caused a reboot.

When I also overclocked I found that the bios want to shut down the pc and start up too fast, this was resulting in the pc not powering up fast enougth so it seemed. What I did was as soon as the pc shut down after saving the bios I would turb off the psu and leave it for 10 second before turning it back on. Since then iv beable to Cold boot and overclock.

Thats hope this was the fix.

i have the same problem, i cnat resolv........ T_T.