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Go back to Dell monitor. Remove any video drivers from hp.change video resolution both in windows and in video card settings to standard 1024 x 768 (yes it will look horrible) then hook up hp monitor. Don't install drivers if prompted get them from hp website then adjust resolution through video card settings after drivers installed which probably require restart.
Once the drivers are installed, your issues should be resolved - the driver will allow only the modes that can be displayed on the monitor - probably giving you options for resolutions you hadn't seen before.
vga uses separate rgb (red, green, blue) connections to compose a video signal, sync and resolution, whereas the video female uses an analog signal with different signal info. you need to get a tv out adapter for your pc that cames with a the display hardware. look for video cards with video out or if you have a digital tv, with hdmi or dvi out. good luck
It would be helpful if you had some more detail to this. However if it's saying no signal, and you're sure that that either the VGA cord is securely connected at both ends, then you may want to check the back of your PC to see if there is another video card installed, and try using that one. I've seen this happen thousands of times.
Typically this happens when the resolution of the display is out of range of the monitor. Normally this is when the resolution is too high. Have you changed the resolution settings? Also, not to be crass, but if there a video card in the system, be sure that you are connected to the correct VGA connector. With an extra card in the system, the onboard VGA connector is not used.
Double check the monitor cable, both going to the monitor, and going to the computer. Ensure it's securely connected. If this doesn't change anything, try rebooting your computer. When the power light flashes, it's in sleep mode and doesn't detect either an analog or digital signal - so either your computer has gone into sleep mode (you can awaken it by hitting any key or moving the mouse) or the cable isn't attached securely. Since your computer is brand new, it's unlikely that anything has broken down already. Another thing to check is to make sure that the resolution in your Display Settings is the correct resolution for the monitor - although it's hard to do this if you can't see what you're doing.
1. It could be limitation of your video card. Older cards would not support high resolution for LCD monitors.
2. Be sure to use DVI(digital) output from your video card. You will not get a good resolution with VGA(analog)
3. When installing driver for a monitor sometimes you will get a chose to install analog(VGA) or digital(DVI) driver. Choose the correct driver.
Did it work properly using a VGA (analog) cable? If so, check your DVI (digital) cable against the pictures at the bottom of http://www.datapro.net/techinfo/dvi_info.html. You probably have one of the two at the left. Each has a different bandwidth, translating to a maximum resolution. The native resolution for your monitor might be marginal if you have a single-link DVI-D cable. My 204B seems very picky about signal-level. It blinks when connected by DVI, even though it should be fine with a single-link cable, and complains about the settings even though the settings are optimal. Maybe yours is similar. I have ordered a dual-link cable and will try that myself.