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OK, see my sig?
Yeah, I'm using an older Slimline than you with the same ATI 2400 GPU.
I'm driving a 1080x1920 digital panel *AND* 2x 1024x768 panels via VGA. I'm dual-head off the 2400 *and* running the onboard video.
Oh, yeah, I've got 2 HDDs in the case. On the original PSU...
First step is to get a minimum vanilla core (MoBo, CPU, PSU & RAM) to POST.
Then you can start plugging stuff in, like KB, mouse, HDDs and extra RAM.
As far as I can read, your RAM isn't the problem. But something about the MoBo / CPU / PSU is wrong.
Are you even getting a beep...
You have 2 sets of RAM.
Have you tried running with 2x 2GB RAM in slots 0 & 1? Then the other 2x 2 GB RAM in slots 0 & 1?
If there's a bad stick, one config will work and the other fail. If it's 2 bad sticks, in each set, you'll need to try the AB & BA combinations to ferret them out.
I run my Slimline with 2 HDDs and added video card for days on end, without issue.
Typically, the HDDs are off (Energy Save), along with the screens, but when I check on it, it's doing fine.
If you're really on a budget, then you simply get the best LP GPU you can squeeze into the case. Which probably means an AMD ATI card, not some nividia thing. ;)
Cooling-wise, worst case, you pull the optical drive and convert it to fans.
But really, you're converting the PC into some...
If you're doing 3-D renders, with the anticipation of upgrading GPU & PSU, why are getting a SFF PC in the first place?
The Slimline is for light duty work, due to the SFF PSU and requirement for LP GPUs.
First, your "friend" really screwed you.
The problem is Windows not having the driver, not the board.
That said, the new MoBo should POST before it hits the HDD for Windows / OS.
I see that ATI Radeon HD5xxx cards are available as low profile (2-slot) config. I'm sure they're somewhat faster, depending on what you're doing. Not sure that they'd be worth an upgrade from a HD4550, tho.
napster - you sure it's not the PSU that's gone bad? As you've got multiple PCs, have you tried powering the slimline with a "known good" PSU from outside the case?