Problems during boot up

I recently bought a couple of new components for my computer (practically everything), i put the stuff together and it booted up without a hitch. For a couple of days it worked fine, got windows installed and everything seemed dandy. Then this morning when i tried booting the computer reached the "memory test" bit (with the energy saving logo and stuff like that), and just stopped, reset and started booting again. I thought, fair enough, this happened yesterday too, but it worked out fine. Now however it just keeps going in loops, start up, memory test, stop, reset, again and again. It doesnt even start performing the test, it just starts writing "memory test, but stops at: "Memory T".

A friend of mine suggested reseting the motherboard, but i havnt tried that yet, since i didnt have time this morning.

I have, however, had a few problems with heat, mainly from my newly installed gfx card, and i havnt gotten round to installing case fans yet, so im a bit worried that the memory modules might have overheated or something or might have been damaged some how (but yesterday i could use the computer without a problem and i didnt perform anything that might use alot of memory).

I coule really use a bit of advice on this problem (seeing as warhammer is right around the corner


Thanks

Try different memory or 1 stick at a time.
Waiting for your specs also.
Please tell us about your power supply also.

Sorry about that, thought i edited it in earlier, apparently didnt work

Motherboard (Gigabyte GA-EP45-DS3P)
http://www.edbpriser.dk/Products/Listpri...

Memory (Mushkin 2 x 2 GB)
http://www.edbpriser.dk/Products/Listpri...

CPU (Core 2 Duo E8400 6 MB (Intel Boxed))
http://www.edbpriser.dk/Products/Listpri...

gfx card (ASUS EAH4850/HTDI(512 MB))
http://www.edbpriser.dk/Products/Listpri...

And a 550W Corsair PSU