I built my computer about a year ago and it worked flawlessly until last week my hd3870 crapped on me so I got the hd 4870 today and now I have no signal to my monitor. I have everything connected the right the cpu fan, the cpu 4 pin, the atx mobo plug, the ram properly seated, cdrom drive pwoered, and hd powered and conected via sata, and the 2 6pin connectors in my hd 4870.When I turn on my computer the three red lights flash on the hd4870 for a second then turn off and the graphics card appears to be working, but I just don't have a signal. Thanks in advance for your help!
Here's my build
Intel Pentium E2160 Allendale 1.8GHz LGA 775 65W Dual-Core Processor Model BX80557E2160 - Retail
Item #: N82E16819116036
Crucial Ballistix 4GB (4 x 1GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model BL2KIT12864AA804 - Retail
Item #: N82E16820146565
GIGABYTE GA-P35-DS3L LGA 775 Intel P35 ATX All Solid Capacitor Intel Motherboard - Retail
Item #: N82E16813128059
Antec NeoPower 550 550W ATX12V SLI Certified CrossFire Ready Active PFC Power Supply - Retail
Item #: N82E16817103941
visiontek hd 4870 512 mb gc
SAMSUNG 20X DVD±R DVD Burner with LightScribe Black SATA Model SH-S203N - OEM
Western Digital Caviar SE16 WD3200KSRTL 320GB 7200 RPM SATA 3.0Gb/s Hard Drive - Retail
Here's my build
Intel Pentium E2160 Allendale 1.8GHz LGA 775 65W Dual-Core Processor Model BX80557E2160 - Retail
Item #: N82E16819116036
Crucial Ballistix 4GB (4 x 1GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model BL2KIT12864AA804 - Retail
Item #: N82E16820146565
GIGABYTE GA-P35-DS3L LGA 775 Intel P35 ATX All Solid Capacitor Intel Motherboard - Retail
Item #: N82E16813128059
Antec NeoPower 550 550W ATX12V SLI Certified CrossFire Ready Active PFC Power Supply - Retail
Item #: N82E16817103941
visiontek hd 4870 512 mb gc
SAMSUNG 20X DVD±R DVD Burner with LightScribe Black SATA Model SH-S203N - OEM
Western Digital Caviar SE16 WD3200KSRTL 320GB 7200 RPM SATA 3.0Gb/s Hard Drive - Retail