Member Avatar for Riggs

Hi

New to this but here goes.I have read all the help there is but this has me stumped.I have an Asus A8N Sli Deluxe mobo AMD64 3200 with two 6800 Ultras and 1gb Corsair memory and 2x Maxtor 80Gb in raid0 run on a Antec truepower 2 550w Psu.Have been running for 2yrs now. Recently my power switch seemed to give trouble wont start then does temperamental as hell.Now the system wont start at all.Tried to bypass switch with reset one tried to jumpstart with screwdriver no luck.Used a piece of wire in pins 14 and 15 and psu powers up all pins giving right current.Used an old 350w psu and everything powers up but now no post.Cleared the cmos with jumper pulled out mobo and set up outside case with only memory and graphics card
plugged in still same.Antec wont fire up and old psu works but nopost screen.I did flash bios a month ago with asus update and the machine has been purring beautifully.Only thing i can think
that was different was our lovely South African load shedding that crashed my PC during a game.

Why can i jump my Antec to work but it wont power up with switch?
Why no post screen now i know the mobo has something like a crash free bios2?

What irritates me the most is it is the last two days of my leave pooring with rain and i cant finish playing airbourne assault.Really P'd off

Any help would be greatly appreaciated
Riggs:@

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  • Latest Post Latest Post by BobDobalina

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Short, focused checklist and next steps based on and posts — aimed at isolating PSU vs motherboard vs front-panel/switch faults and giving clear recovery options.

Start with the basics you probably haven't checked (or double‑check them): verify the PSU standby rail (+5VSB) with the PSU switch ON but the system powered down; the PS_ON (green) wire shorted to any ground (black) should make a healthy PSU spin its fans. A supply that shows correct voltages with no load but dies once the board is connected is still a faulty supply. Also confirm the CPU 4/8‑pin 12V connector is actually plugged in — boards will spin fans but will not POST without that.

Isolate the board with a minimal bench test in this order: remove all drives, unplug extra PCIe cards so only one video card remains, fit a single RAM stick in the manufacturer-recommended slot, connect the CPU power and 24‑pin, attach a system speaker, and try power. If still no POST, swap the RAM stick and try other slots; try a different known-good PSU; reseat the CPU (inspect for bent pins) and look for obvious damage — bulging or leaking capacitors and scorch marks commonly rule a board out. If the front-panel switch behaviour is intermittent, try a simple jumper or a different momentary switch on the front-panel header to rule out wiring/case issues.

If the board gets power but produces no POST after a sudden loss of mains or a BIOS flash, BIOS corruption is possible. Use the A8N‑SLI Deluxe documented recovery procedure (CrashFree BIOS) from the ASUS manual/support site: obtain the exact BIOS for the board and follow the recovery method in the manual. Do not try random BIOS files — a wrong file can make recovery harder. If CrashFree fails or the BIOS chip looks damaged, factory service or a local repair shop with a BIOS programmer is the practical next step.

Work methodically: one swap at a time, document what changes, and stop when the fault moves with a part (that part is the suspect). If uncertain about mains testing or swapping CPUs, seek local service — working on power rails and CPU sockets carries real risk to components and to personal safety.

Member Avatar for Riggs

:angry: :@

Ok now i have re assembled everything and switched the power to psu back on.The Antec will not start up so i have taken the wire clip i made and with the 24 pin connected to the board have gone through the back and forcefully jumped pins 14 + 15 to start the power still nothing booting.all power starts on mother bord but there is no post screen and my monitor does not even power on.

Monday has gone

Riggs

Member Avatar for Riggs

:-/

Are there any moderators who deal on this subject?

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Echo Echo Echo
Hello Hello Hello
:?:

Member Avatar for BobDobalina

Hi Riggs, did you manage to figure this out? I'm having the same problem you are, and the same mobo/PS combo as well, which is a little disconcerting. I've done some Googling and found a number of others with the same issue with this motherboard, and some speculated that there was some incompatiblity with the PSU, but you're the first I've seen mention Antec as well.

I'm a bit stumped ... tried what you have, including a new power switch, putting a jumper on the power switch connector, and disconnecting devices. No juice; just dead.

My PSU is still fairly new and I can't believe it'd be blown already ...

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