Can Error Code 99 result from a defective power supply unit?
Can Error Code 99 result from a defective power supply unit?
Hello,
on my AsRock 990FX Extreme 4 the POST halts at Code 99.
I did everything I could:
removed all connections, reset CMOS, pushed the reset switch, replaced the CMOS battery, applied a new paste to the CPU cooler, swapped the RAM, and changed the video card.
The only remaining possibility is checking the PSU.
In fact, the V2 output shows LL.
My question is: could that be the cause?
I’m asking before purchasing a new power supply.
I read that code 99 might result from a faulty motherboard, but nothing had moved or changed.
I would really appreciate advice on this!
Thank you,
Dorian
According to the motherboard's manual provided, the post code 99 indicates Super IO Initialization. This discussion was shared in the Power Supplies section, but it wasn't specified the make, model, or age of the suspected power supply unit. When posting troubleshooting threads, it's usually helpful to include full system specifications such as CPU, cooler, motherboard details, RAM, storage, GPU, PSU, chassis, OS, monitor, and the BIOS version. If you remember the BIOS version, try booting with a single RAM stick. It might be wise to borrow or purchase a reliable PSU from someone else before buying a new one. Additionally, consider getting a CH341A BIOS Programmer and see if updating the BIOS resolves the issue.
Hello, thank you for your prompt response.
I had the PC assembled quite some time back and I recall only a few details.
The CPU is AMD, the cooler resembles a tower with a fan on the side named Sythe.
Motherboard I mentioned earlier: AsRock 990FX Extreme4.
RAM is PanRam (x2) 8 GB each.
GPU is Zodac GT 740.
PSU I don’t remember.
Sys Drive is a Samsung SSD 500Gb.
Cassis was designed by a German company.
OS is Windows 10.
Monitor is Dell.
I replaced the RAM sticks, bought a new one and inserted just that one.
It’s clear: you can borrow a PSU from a friend—most of my friends have either a Mac or a laptop.
No one uses a desktop like me anymore.
A BIOS programmer wouldn’t help because I have no video whatsoever.
Oh, I should note: I connected the HDMI cable but didn’t get any video output; then I tried a DVI cable too—still no video.
The PSU I used had to be changed once—it’s a KRPN-AK650W/88+ model.
BIOS details are really unclear to me.
Extra information: All fans are functioning properly.
I also performed a CMOS hard reset (removed power cord, removed CMOS battery for 10-15 minutes, pressed the power switch for 15 seconds). Since it seemed connected to USB, I took out the USB 2 and USB 3 connectors and tried booting—results stopped at 99.
Additional notes:
I am now at least getting a video output, though it still hangs at 99.
Progress is better, but further steps will be easier.
I remember seeing the code at the bottom of a website before; it took some time to locate it.
I’ll begin checking all my USB connections.
My printer is a HP Office Jet 8620, connected via USB—it often causes issues like refusing to print or creating new printer options.
Thank you.
I just confirmed that everything has been restored to its original state, WIN 10 is functioning again, and access to all my drives is working properly.
What I did:
I took out
everything, including the SATA cables, cleaned the contacts on my video card, RAM sticks, and the HDMI cable. I removed the CPU cooler, applied fresh heat transfer paste, took out all USB 2 and 3 connectors, and reinstalled the ATX on the motherboard. It’s hard to say exactly what caused the error code, but it seems to be resolved now!
The only issue remaining is occasional freezing—usually the mouse works fine, but after a few seconds everything resets.
Where should I share this question?
Thank you.
Dorian