Pc booted, but now wont.

Question

Ok
I just got a board today (been after one for ages), a K7N2 Delta ILSR (especially after i built a system for my bud with 1) and proceeded to rip my old system to pieces and installed the new K7N2 in place of my KT3 Ultra 2C.
Powered up, and it took off, not a problem. (at this stage i had reached Windows and hadn't installed all the nForce drivers or took off  the Via stuff)
So i shut it down to go into the BIOS and disable all the stuff i didnt need (onboard sound, modem, set AGP apature to 256mb based on the recommended half your system ram size for you aperture size) went thru checking my settings, and it was reading ok.
I saved the info to the cmos and restarted.
it whirred
but my screen didnt come on.
I checked the D Bracket, and its telling me that the system is now hanging at the memory test (only LED 2 is green, rest are red)
So i powered down, whipped out the ram, cleaned it, reseated it (1 stick in slot 1 , 1 in slot 2. RAM is Kingston Infineon 2 x single sided 256 sticks of ddr333 ram) and its the same.
I tried reseating just 1 stick in slot 1 (tried this with both). and i then get 1 long beep, it stops, 5 sec later, 1 long beep. This continues till i shut it down.
I then try both sticks in slots 1 & 2 (both purple's) and again, 2nd LED lit, pc fails to initialise, and the same bios beep occurs.
I open her up again, clear the CMOS and reset it. put the ram back in the original config (1 purple, 1 green) and again, it fails to boot, leaving #2 LED lit but no beeps.
I whipped the board out and put my old KT3 back in, and everything works fine.
SO i rerig with the K7N2, and same problem, wont boot beyond failing the initial memory test.
So far its taken me 4 hrs, and i've swapped boards and such 4 times, tried with just basic rig and still it wont boot past the memory test.
At this time im stumped, as the pc i built for my bud with the same type of board, worked fine with a budget (not sure if its the same kingston infineon stuff, but i got it from Savastore.com/watford in the uk) Yet after this initial boot up when it did work, now it refuses to.
Is it likely that the board has a fault and needs returning? (will be the second K7N2 board i've worked on that needs returnin after less than 6 weeks use, my buds one topped itself after he looked into flashing the bios, tho he didnt actually do it, his died completely a lil while later, wouldnt even power up when switched on. No power light nuthing on the d bracket, was just dead)
Has my adjusting of the AGP apature, disabling the Modem and Audio and setting the first boot display slot to AGP from PCI really killed my board too?

Answer 1

Ok
just tried to set the beast up, and guess what, same as before.
The pc powers up, the D bracket gets to  led 2 in the test and the machine hangs (memory problems)
The pc emits 1 long beep, pauses, 1 long beep, pauses........so on and so on, until i switch it off.
The ram is getting the right voltage and *seems* to be working correctly (the GeIL golden dragon pc3200 Ultra dual channel. see links) yet the pc hangs and wont do a thing. I've tried reseting the bios, i've tried remnoving the battery and then replacing it after a period of time (as someone suggested, god know why as it didnt do jack), i've tried various different ram sticks in every possible combination, and still the darn thing refuses to POST (so for all those who keep sayin *give it a clean install*, I CANT DANG IT)
Seems this board shall have to go back to the supplier, and i'll just have to try my luck with something else.
Cant believe i'm having so much trouble from a piece of kit, from a manufacturer whose stuff i have always used    
heres the ram i tried last
http://www.geilusa.com/proddetail.asp?linenumber=14#
http://www.geilusa.com/supportdetail.asp?linenumber=8
time to go shopping for a differnt board