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kopfjaeger · February 18th, 2007, 02:09 AM

Gents,

Have been tasked with taking a 2d-hand Abit BX133-RAID http://www.abit-usa.com/products/mb/...es=1&model=107 and turning it into a friend's free machine. The board came with an Intel Pentium III Coppermine 800/256/133/1.75 -- that's it.

I have tested 3 different ATX power supplies, each of them tested with a dedicated PSU tester.

TEST CONFIGURATION

- Barebones, only a video card. Have tested it with both an AGP card and a PCI / VGA video card, same results.

First, with 2 x PC100 / 128 MB DIMM SDRAM modules, then with a replacement single PC100 / 128 MB DIMM SDRAM module in DIMM1 (where DIMM1, DIMM2 & DIMM3).

CD / HDD/ FDD are connected in respective IDE ports.

CPU fan is connected directly to PSU by Molex connector

SYMPTOMS

Power LED on mainboard comes on. No other activity. Zilch, nix, nada.

Pull power connector from board and run PSU test, leaving other Molex connectors fastered to CPU Fan, CD / HDD/ FDD - > CPU and PSU fans spring to life.

Checked capacitors for signs of swelling, brown leakage, showing overheating, melting = no visible signs of either symptom.

MY GUESS

PSU(s) check out as good. Note, none are Dell proprietary PSUs, one even states 'for Pentium.' Power is getting into the mainboard, at least as far as the mainboard's on-board power LED (not to be confused with Power LED on the front of the case). But something within the mainboard's circuit not allowing power to the rest of the system.

QUESTION

- Possible causes and cures?

Thanks in advance.

KJ

February 18th, 2007, 02:09 AM	#1 (permalink)
kopfjaeger Member Join Date: Jul 2003 Posts: 320	Board LED lit, No Power, Won't boot Gents, Have been tasked with taking a 2d-hand Abit BX133-RAID http://www.abit-usa.com/products/mb/...es=1&model=107 and turning it into a friend's free machine. The board came with an Intel Pentium III Coppermine 800/256/133/1.75 -- that's it. I have tested 3 different ATX power supplies, each of them tested with a dedicated PSU tester. TEST CONFIGURATION - Barebones, only a video card. Have tested it with both an AGP card and a PCI / VGA video card, same results. First, with 2 x PC100 / 128 MB DIMM SDRAM modules, then with a replacement single PC100 / 128 MB DIMM SDRAM module in DIMM1 (where DIMM1, DIMM2 & DIMM3). CD / HDD/ FDD are connected in respective IDE ports. CPU fan is connected directly to PSU by Molex connector SYMPTOMS Power LED on mainboard comes on. No other activity. Zilch, nix, nada. Pull power connector from board and run PSU test, leaving other Molex connectors fastered to CPU Fan, CD / HDD/ FDD - > CPU and PSU fans spring to life. Checked capacitors for signs of swelling, brown leakage, showing overheating, melting = no visible signs of either symptom. MY GUESS PSU(s) check out as good. Note, none are Dell proprietary PSUs, one even states 'for Pentium.' Power is getting into the mainboard, at least as far as the mainboard's on-board power LED (not to be confused with Power LED on the front of the case). But something within the mainboard's circuit not allowing power to the rest of the system. QUESTION - Possible causes and cures? Thanks in advance. KJ __________________ This is supposed to be a joyous occasion -- let's not bicker over who killed who.