No Signal after Building New Rig

Built a desktop

Gigabyte GA-EP45-DS3R
Intel C2D E8500
ATI HD4850
Corsair TX650 PSU
WD SATA 640gig
mushkin 2 x 2gb DDR2 800
Acer 22" LCD

The thing powers on fine. All the fans come on. The dvd-drive opens and shuts. But no signal to monitor.

The 4850 has a red LED on the back of it. Is that normal? I did a quick google and saw that some people said it was normal, others said that it staying on indicated a problem. Well, mine stays on... hmm... I've removed/replaced the card a couple of times and tried different power cords. Even tried a Molex--> PCI-E power converter which didn't work. Really just clueless on this one.

I've reseated the cpu but that did not help.
I've checked all the connections but I will do a more thorough job tomorrow if I can't get this working soon.
I removed one of the memory sticks then tried switching them but that didn't help. The thing doesn't POST at all. No Sounds come from the mobo.

One more thing, there's this "Phase LED" with like 6 diff. colors that supposedly refer to processor load (according to manual, confusing..) all of them are on. Not sure what this indicates.

I'm exhausted and frankly very dissapointed this thing isn't working Everything I bought was retail. I was very careful to regularly 'ground' myself by touching the case and not sure what else to say.. Thanks for any help you can provide.

As much as I would like to believe it's the monitor at fault (which perhaps it is also). I am getting no beeps no matter what I do/remove, and the keyboard's caps lock key light is not turning on which, sadly, makes me believe the computer is not booting. If clearing CMOS isn't working and I'm getting no beeps. Possibly a bad mobo? ****, I really don't feel like dealing with an RMA

Did you connect both the 24 pin power and the 4 pin power (located near the CPU)?

bingo bango bongo. touche good sir

I am having the exact same problem. I have both the 24 and 4 pin power connected. I have checked all my connections. I haven't reset the bios by jumpers just yet. I think I will try that next. but could there be anything else that I am missing?

For people using catalys and a dvi cable, i had the problem, my computer would boot up and everything, windows would load, log in, my programs would start but nothing would appear on the screen. loong google search came upon me figuring the problem. at defualt the dvi frequency is too high. so what you need to do is:

use a Dvi->vga adapter and plug your montor in via vga. go into your video control panel and find the setting for DVI, look for DVI frequency, and check/select reduce DVI frequency. whala. problem solved. now you can plug in the your monitor via dvi and not have to worry about no signal

Sorry for the repeated posts...

I hooked my monitor up to my girlfriend's laptop and it works, so its not the monitor.

So to recap, the system boots (confirmed by turning on sound, also pushing the caps lock key), but does not show anything on the monitor while at home. At work, using the same system (but not the same monitor, keyboard, or mouse), everything functions normally. Connecting the monitor to another computer works. Connecting another monitor to the computer does not.

Both pieces of the puzzle work individually, just not together.