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"Any beeps from board at startup?"
If you have a case speaker hooked up to the proper pins on the mboard, you should hear the normal one beep, or sometimes two beeps, indicating the bios has passed the POST.
If you hear no beeps, apparently it's possible the ram you had in the old mboard may not work properly in the new mboard - it's also possible the ram was damaged - remove the AC power to the PS, remove all the ram modules, restore the AC power, you'll get no video but see if you then get a beep pattern that indicates no ram installed or a ram problem.
(When the ram is incompatible with the mboard sometimes you get no beeps at all.)
ATI Radeon™ HD 4890 Graphics System Requirements
■500 Watt or greater power supply with two 75W 6-pin PCI Express® power connectors recommended (600 Watt and four 6-pin connectors for ATI CrossFireX™ technology in dual mode)
■Certified power supplies are recommended. Refer to http://support.amd.com/us/certified...
for a list of Certified products
Just the HD 4890 video chipset needs up to 190 watts in the real world:
The vast majority of that is required at +12v.
"The old one was a Ultra Raptor 500 and now the new one is a Ultra LSP 550."
Neither model is listed
Power supplies of the same wattage capacity vary considerably regarding their max current at +12v, which is the vast majority of the power the video chipset on the card needs.
Ultra power supplies fall into the middle of the pack as far as I've seen - they seem to be reasonably reliable but their max +12v amperage output tends to be modest.
Ultra LSP 550
One +12v output
+12V 1: 30 A
This Item's Limited Warranty is:
- 36 Months Parts
- 36 Months Labor
Antec SmartPower 2.0 SP-500 500W ATX12V SLI Ready Modular Power Supply
Parts3 years limited
Labor3 years limited
(37 A total)
Antec High Current Gamer - HGC-520
One +12v output - 40 A
+12v max output - 480 watts (the full 40 anps)
No Ultra Raptor 500 found.
Searching the above Ultra website with Raptor finds nothing. There's no apparent support for their older models there - not a good indication.
It may be the same as this, re-branded:
HEC/Compucase Raptor 500Watt Version 2.2 Power Supply w
No +12v output spec
It could very well be that your original power supply was overloaded when the 4890 was installed and that overloading eventually damaged the power supply, causing it to fail.
Unfortunately, when a power supply fails, sometimes it damages something else while doing so, most often just the mboard, but in some cases other components as damaged as well.
Your power supply must have at least the minimum capacity required to support a system with the graphics card you are using installed, or the max graphics card you might install in the future.
(Onboard video - video built into the mboard - IS NOT A CARD ! )
If that info is not in the ad for the video card, you can go to the video card maker's web site and look up the specs for the model - often under system requirements - the minimum PS wattage, and, more important, the minimum amperage the PS must supply at 12v is stated. If you don't find that, any card with the same video chipset including any letters after the model number has very similar minimum PS requirements. Some power supplies have two or more +12v ratings - in that case, add those ratings to determine the total +12v current capacity.
If you're a gamer...
In most if not all cases, the max capacity rating of the PS is an intermittent rating. It's recommended that you do not load your PS to any more that 80% of that rating if you are going to be using something that puts a constant load on it, such as playing a recent game for hours on end. In that case, you multiply the min capacity stated for the system with the particular video chipset on the card by 1.25 to find the min. capacity of the PS you should have.
In this case for the 4890, 500 x 1.25 = 625 watts minimum .
It never hurts to buy a power supply with more capacity than you need.
"Its a G31M3-F mATX motherboard."
There are three version series of G31M3-F shown here
and four shown here:
Plain G31M3-F support, Basic specs:
Chipset Intel® G31+ICH7
"• Due to the limitation of G31 chipsets, dual channel support must meet some requirement in the specification of memory modules. please refer to Test Reports for detailed description."
Supported modules - no other info
"Intel Core 2 Duo E7300 2.66Ghz 3MB 1066MHz "
According to the four entries for G31M3-F on this page
.....all the mboard versions support recognizing that cpu, if the bios version has the quoted specific version or higher.