HELP - new build wont boot!

[Silent Spring]

hi all just finished my third pc build as follows

Intel Core i5 750 2.66Ghz (Lynnfield) (Socket LGA1156) - OEM £119.99 1 £119.99
Powercolor ATI Radeon HD 5770 1024MB GDDR5 PCI-Express Graphics Card + Ruby Doll £104.33 1 £104.33
Gigabyte GA-P55-US3L Intel P55 (Socket 1156) DDR3 Motherboard £81.73 1 £81.73
Microsoft Windows 7 Home Premium 64-Bit - OEM (GFC-00599) £69.56 1 £69.56
Geil Ultra Series 4GB (2x2GB) PC3-17000 2133MHz Dual Channel Kit (GU34GB2133C9DC) - OEM £63.47 1 £63.47
Corsair CX 400W ATX Power Supply (CMPSU-400CXUK) £34.77 1 £34.77
Coolermaster Elite 335 Case - Black £26.95 1 £26.95
Samsung SpinPoint F1 250GB SATA-II 8MB Cache - OEM (HD251HJ)


now when i power up all the fans spin and the CPU lights up but i get no image on the screen, and the beep code error is like nothing i have never heard!

it is a uncountable amount of very short fast last beeps then a 10 secind gap untilll they start again.

i hope this is a simple problem and i have just done somethin stupid

also i am using the stock cooler and a sony cdrom drive

thanks

 

[RJC]

All power connections in including the 8 pin for cpu power and power to the gpu.

Memory installed in the correct slots - did this on my i7 build or try one module at a time.

And a trusty CMOS reset.

 

[Fromez]

Your GPU PSU requirement is 450 watts. Could be that?

 

[Silent Spring]

it was the memory installed in the wrong slots! doh!

put it in 1 & 3 instead of 2 & 4 works fine now thanks all