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New PSU, no POST or BIOS, tried everything

post #1 of 4
Thread Starter 
Okay, from the beginning. There was nothing wrong with my previous PSU other than a fan noise issue. I simply decided to upgrade my video card and needed extra power to handle it, so I ordered both parts simultaneously. I replaced the PSU first, all the connections match up exactly as before, but now the monitor displays nothing, and nothing I do changes this. In fact, the issue persists even when I put the original PSU back in.

The PSU and system board have power, all fans run, original video card runs, hard drive is spinning, and the DVD-ROM drive functions. But it refuses to show any POST, BIOS, or anything at all on the monitor, as if nothing is happening. Unfortunately, it looks like my motherboard did not come with a system alarm, so I don't have beeps to go by. I've removed components and tried booting in every way I can imagine. Removed the video card and tried onboard video with no change. Eventually installed the new video card to give it a shot, but that did nothing. I've probably jumped the CMOS battery 30 times by now. I'm not new to this, but it's making my brain do backflips. Is the motherboard just magically bunk all of a sudden?

My exact original PSU: http://www.eplanetnv.com/catalog/product_info.php?products_id=480

New PSU: http://www.newegg.com/Product/Product.aspx?Item=N82E16817182044

Original video card: http://www1.sapphiretech.com/us/products/products_overview.php?gpid=175

New video card: http://www.newegg.com/Product/Product.aspx?Item=N82E16814130565

My exact motherboard: http://www.asus.com/Motherboards/Intel_Socket_775/P5LMX/

I plugged everything in accordingly. 24 pin main connector, 4 pin CPU power, SATA power for the HDD, Molex for the DVD drive, and a 6-pin for the old video card (two 6-pins for the new one). I notice the HDD LED remaining solid for a good 20 seconds on each boot attempt before it goes off, if that means anything. Just... any help would be appreciated. I've handled these issues for years and never had to resort to forums before solving them, so this is my first time having to do this. Thanks in advance.
post #2 of 4
Sounds like the board has had it.

Also the powersupply you bought...........ummmm isnt the greatest biggrin.gif

Welcome to ocn
post #3 of 4
Did you applied a lot of force to insert or remove a connector?. Anyway, apply a bit of pressure on the northbridge heatsink, CPU heatsink and southbridge heatsink. Can be a bad solder joint that got really damaged when you changed the PSU.
Good Enough Rig
(14 items)
 
  
CPUMotherboardGraphicsRAM
FX 8350 GA-990FXA-UD3 RX 480 Nitro+ (Passthrough) + XFX 5770 (Secondary) Kingston HyperX (4x4GB) 
Hard DriveCoolingOSMonitor
3x Samsung Spinpoint F3 Hyper 212 EVO Fedora 25, W8.1 virtualized with KVM + GPU Pass... ASUS VS228H-P 
PowerCaseAudio
Corsair TX650 CM Elite 330 Onboard ALC889 + HDMI Passthrough 
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Good Enough Rig
(14 items)
 
  
CPUMotherboardGraphicsRAM
FX 8350 GA-990FXA-UD3 RX 480 Nitro+ (Passthrough) + XFX 5770 (Secondary) Kingston HyperX (4x4GB) 
Hard DriveCoolingOSMonitor
3x Samsung Spinpoint F3 Hyper 212 EVO Fedora 25, W8.1 virtualized with KVM + GPU Pass... ASUS VS228H-P 
PowerCaseAudio
Corsair TX650 CM Elite 330 Onboard ALC889 + HDMI Passthrough 
  hide details  
Reply
post #4 of 4
Thread Starter 
Quote:
Originally Posted by ryanbob1234;14661389 
Sounds like the board has had it.

Also the powersupply you bought...........ummmm isnt the greatest biggrin.gif

Welcome to ocn

Why do you say that? You looked at the one I replaced, right? It ran my computer perfectly for 4 years on only 400 watts and was only $30 when I got it. I have one hard drive, one optical drive, 4 gigs of RAM, a single fan on the case, and the video card is the highest end thing about it. I don't have a RAID setup or 20 fans in my computer. The PSU should be more than enough.

But yea, I haven't wanted to accept the motherboard being shot. I mean, I did the transition in a static free environment, everything powers fine, there is no burning smell, I've dusted the thing every 3-4 months, and no capacitors look popped. I'll try the pressure on things and get back to this. But everything went pretty smooth when I originally installed it.
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