Memory Compatibility Problems

I just bought (2) 512MB sticks of Corsair XMS DDR400 from newegg.com. I'm trying to install the memory into my computer and it wont boot up. It'll try to boot, then I get 1 long beep and 4 short beeps, and then it shuts down immediately after that. I have an Abit AG8 motherboard which supports DDR400 up to 1GB per slot. The manual said when installing two similar memory modules to use DIMMS 1&3 or DIMMS 2&4 on the motherboard. I tried both configurations and both do not work. I already tried clearing CMOS and that didn't work either. I won't even boot up long enough for me to get into the BIOS. If anyone can help me or if you can at least tell me what the POST beeps mean it would help me a great deal. I really don't want to return this awesome memory but I will if that is the problem. Thank you

 

You need to tell us what mobo and or what BIOS you have for use to be able to tell you what the beep codes mean.

I had a very similar problem with two sticks of kingston RAM, though. It would only take 1 boot up attempt for the CMOS to need to be cleared. I would recommend trying that again/more, as it was the solution to my problem...

 

My mobo as I mentioned is an Abit AG8. The BIOS is by Phoenix. It has the Intel 915P chipset, Pentium 4 3.0GHZ LGA775 CPU, 256MB ATI Radeon PCI Express Video Card. Also, the RAM I used to have in there was a Corsair Value Select 512MB DDR400 stick. I figured RAM by the same manufacturer should definitely work, especially Corsair RAM. I tried clearing CMOS again but it didn't work.