My computer beeps and wont display.

Hi, I have just changed my power supply due to a crash....but it the computer beeps 4 times and wont display...
Intel® Core™2 Quad Q9550 (2.83GHz) 1333MHz FSB/12MB Cache
Motherboard ASUS® P5Q DELUXE: DUAL DDR2, S-ATA II,2 x PCI-e x16, 2 x PCI, 2 PCI-E x1
Memory (RAM) 4GB CORSAIR DOMINATOR 1066MHz - LIFETIME WARRANTY! (2x2GB)
Graphics Card 2GB ATI RADEON™ HD 4870X2 PCI EXPRESS
Memory - 1st Hard Disk 1TB SERIAL ATA 3-Gb/s HARD DRIVE WITH 16MB CACHE (7,200rpm)
2nd Hard Disk 1TB SERIAL ATA 3-Gb/s HARD DRIVE WITH 16MB CACHE (7,200rpm)
1st DVD/BLU-RAY Drive 22x DUAL LAYER DVD WRITER ±R/±RW/RAM
Memory Card Reader: INTERNAL 52 IN 1 CARD READER (READS XD, MS, CF, SD, etc)
Processor Cooling: COOLIT DOMINO A.L.C. CPU LIQUID COOLER
Sound Card: ASUS XONAR HDAV1.3
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More about computer beeps wont display
  1. Looking at the online manual for the P5Q Deluxe, there is no error which corresponds with just four beeps.

    The nearest I can see are:

    One continuous beep followed by three short beeps = no video adapter detected.

    OR

    one continuous beep followed by four short beeps = component hardware failure.
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