|"I didn't know whether I should connect the hard drive or not, so I didn't."|
You can't boot from the hard if it's not connected, but you don't need to connect it to determine whether the mboard is booting OK. You should see text on the screen while booting if there's nothing wrong. You may get an error message, but you should see text in any case.
The fans and hard drive spinning doesn't necessarily indicate there's nothing wrong with the power supply and/or the mboard.
Did the computer shop use the same ram you were using on the original mboard, or did they supply you with other ram ??
It is easy to test for whether it's only the ram that is your problem.
If you have installed ram that was not installed and working fine in this mboard previously, it may not be compatible with your mboard. It is easy to test for incompatible ram that has caused your mboard to fail to boot.
Make sure you have a speaker or speakers or the equivalent connected to the mboard so you can hear mboard beeps (see your mboard manual if you need to).
Remove the AC power to the case/power supply.
Remove all the ram.
Restore AC power.
Try to boot.
If nothing else is wrong, you will get no video but you will hear a pattern of beeps that indicate no ram is installed, or a ram problem.
E.g. for an Award bios or a bios based on one, that's often a beep of about a half second, silence for a half second, a beep of about a half second, silence for a half second, continuously.
"fans spin for 1 or 2 seconds, giving me a short beep "
The fans should spin all the time the computer is running, if there's nothing wrong, but some power supplies have a temp controlled fan or two of them, and they may spin slower when the computer interior is cooler, and a cpu fan may spin slower when the computer interior is cooler.
There must be a 3 wire female connector from a 3 wire fan, it's supposed to be the cpu fan, connected to the 3 pin header for a cpu fan on the mboard, otherwise the mboard will often shut off automatically when no rpm is detected from the cpu fan header, within a very short time, to prevent the cpu (processor) from burning out.
One short beep is normal.
No beeps or a long beep or any other pattern of beeps is not normal, if the ram installed is compatible and is not damaged and has a good connectoin in it's slot(s) , and the video adapter is fine.
"I'm not sure what you meant by connecting the monitor to the onboard video out"
Your D865GVHZ has onboard video, and no AGP slot, but it has 3 PCI slots.
If you have a PCI video card in a PCI slot (a PCI slot is usually white or creme colored, there may be more than one) usually the onboard video port on that mboard WILL STILL produce video when there is a PCI video card in a slot.
If you suspect you might have a problem with a PCI video card that's in a slot, and you have a mboard that has onboard video, then you can try removing the video card that's in a slot, and connecting your monitor to the port for the onboard video.
If you bought the W2646 in North America, you had one of 4 possible mboards.
All were made by Trigem, or were not made by them but are exclusive to Trigem, the same Korean company that actually made the emachines system.
Unofficial mboards info:
Manuals for three of the four mboards are available at the end of the Downloads on the left side of the screen. If theone for yours is there, you can check your wiring connections to the mboard, etc., in that.
NOTE that that web site may have suspended allowing downloads - donate to it if you can afford to.
All of them:
Chipset: Intel 82845GL / 82801DB / 82802AB
Processor Socket Type: mPGA478
Processor Family: Pentium 4 (Northwood, Willamette)
Maximum Processor Core Frequency: >=2.2 GHz Northwood; 2.0G Hz Willamette
Processor Front Side Bus Frequency: 400/533 MHz
Retail mboards made by Intel are often also OEM supplied to brand name system builders and in that case the Intel made mboard almost always has the brand name's bios version on it rather than an Intel version.
Does the D865GVHZ have an Intel bios version, or another brand name bios version??
If you had video, the bios string that's displayed while booting will indicate whether it has an Intel bios version or a brand name bios version.
the bios string is usually a long string of numbers/letters at the bottom of the first black screen as you boot your computer - it often begins with a date - usually you can press the Pause key to read it and copy it down.
Press any key but Pause to continue booting.
Newer Phoenix bios strings, based most often on those for Intel mboards, are often like so: xxxxxxxx.xxx.xxxxxxxxx and have no date at the beginning of them.
An Intel bios version:
The first TWO sections of the BIOS Version indicate the BIOS ID code (in the example: SGP4510H.86A).
If the number in the middle of the string is NOT 86A, it's another brand name bios version.
The key you press to get into an Intel bios version's Setup is F2; it may NOT be F2 for a another brand name bios version.
I'm assuming it has an Intel bios version.
The D865GVHZ has a newer main chipset than your original mboard.
The ram and the cpu you were using on the original mboard may or may not work properly with the D865GVHZ.
Cpu support list for the D865GVHZ
The cpu you are using must be in the list, and preferably NOT one of the ones marked with yellow.
The highlighted blue numbers on the left are the Intel part number, and if you click on the highlighted blue numbers, you can find the Sxxxx model and what type of cpu it is - e.g.
Northwood, or Willamette.
The Sxxxx model, or the Intel part number, that's on the top of the cpu you're using, must be on the list.
See the notes at the top of the list for which bios version the mboard must have, or higher, to recognize the cpu properly.
You can't tell which specific bios version the mboard has unless you can get video, unless the mboard was new and the bios version is stated on a label on it's box, which usually isn't there anyway.
If the cpu you installed is not supported by all bios versions, then if the present bios version is not high enough, your mboard may not boot all the way. In that case, you, or the computer shop, must install a cpu the mboard already recognizes fine, and flash the bios to the latest non-beta bios update version available on the Intel web site.
It is also possible, if you are using the cpu that was in the original mboard, that the original BESTEC PS may have damaged the cpu as well as the original mboard while failing.