Question about Micro-Star MSI A55M-P33 Desktop Motherboard - AMD A55 Chipset - Socket FM1

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New computer build will not POST

Just finished new computer build, with above motherboard, and AMD A4 3400 APU. Fans and lights turn on, monitor turns on but does not POST. I do get a cursor in the top left hand corner, and in the bottom right hand corner it reads "99"

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Check your hard drive and weather or not you have the drive set to IDE or ACH

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May 22, 2014 | ATI Computers & Internet

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New build doesn't beep

A) Power Supply checks out?
You have tested the three main voltage power rails?
3.3 Volts
5 Volts
12 Volts?

What were the voltages?

Post back in a Comment.

1) If ALL the LED lights were on at once, they would use less than 1 Watt of power.

2) EACH fan uses 2 to 3 Watts of power

3) A typical Processor (CPU) uses 51 to 125 Watts of power.
Just depends on what Processor it is.

AMD Sempron 100 series? 45 Watts
AMD Athlon II? Could be up to 95 Watts
AMD Phenom II? Could be up to 125 Watts.

Don't assume because you see LED's light up, and fans spin; that your Power Supply is good.

A Power Supply with a weak voltage power rail, will not have enough power to turn the Processor on.

B) The motherboard mounts to a Support Plate.
The Support Plate can be a separate metal plate, or an integral part of the computer case's metal frame.

Mounting of the motherboard to Support Plate, is accomplished with either plastic Spacers; or metal Standoff's.

If using metal Standoff's, make SURE all Standoff's are matched to a motherboard mounting hole.

IF, a Standoff is NOT matched to a motherboard mounting hole, there is a good chance it can touch the exposed solder joints; on the bottom of the motherboard.

Result? Short Circuit of motherboard.
MOST, of the time the 'offending' Standoff can be removed; or relocated, and the motherboard is OK.

C) All power cables from the Power Supply to motherboard, plugged in, and plugged in tightly?

New motherboard, and the connectors will be TIGHT, usually; when plugging things into it.

D) Disconnect everything except Processor, processor fan power, and Ram Memory.

Means unplug Harddrive power cable, and data cable.
Optical drive power cable and data cable
Card Reader cables, IF used.
USB Front Panel cables.
Computer case fans.

BARE minimum.
Turn the power supply on. (Press the Power on button)
You are at this point, just trying to see if you can get the BIOS Setup screen to come up.

(Press - enter BIOS Setup key)

BIOS Setup screen comes up, go on.
BIOS Setup screen does not come up, there is a problem with the motherboard.

BIOS Setup screen comes up, don't tarry around.
Turn the computer off.
(Press the Power On button in for a count of 10 seconds, or until computer turns off)

Computer case fans not plugged in, you don't want to overheat the motherboard chipset. (Especially the Northbridge chip)

Then add harddrive, and hook up computer case fans.
Everything looks good so far, then plug Card Reader in.
Then plug Front Panel USB cables in.
(The front of your computer is the Front Panel)

Had a person the other day find out it was his USB cables/USb ports; that were the problem.

E) By the way............
There are Solid Capacitors surrounding the Processor, and as you can see; other areas on the motherboard also.

However there are Electrolytic Capacitors on the motherboard too.

See them by the Northbridge chip, (Aluminum Heatsink is on it), and around the expansion slots? (PCI and PCI Express x1, and x16)
Around bottom of motherboard also?

The ones around the expansion slots I'm not that concerned about, as much as the ones around the Northbridge chip.

My belief is that the ones around the expansion slots, are used as Filters.

However the ones around the Northbridge chip, (And solids around the Processor), are used for Voltage Regulators.


Know what really bites?

Electrolytic Capacitors have Electrolytic Paste inside.
This is a chemical, and works with a chemical reaction.
It breaks down over time, also.

Can also just dry up inside, and show no outward visual signs of capacitor failure.

Plus, can I state this tactfully?
ECS motherboards are not known to be the 'cream of the crop', if you know what I mean.

For additional questions please post in a Comment.


Mar 19, 2013 | ECS A780LM-M2 Socket AM3/ AMD 760G/ A&V&L/...

1 Answer

My husband recently built a new computer (previously built 5 others successfully). Motherboard seems to be working properly. Green LED lit. Graphics card works in another computer. Power supply...

Hi, the thing to do here is to narrow down what could be causing the problem, initial suspects would be the RAM chips. If you have known working ones you can try in it, try these, if not, try without one, then swap them over, or even try without both.

Also, remove any components that aren't strictly necessary, i.e. hard drives & cables, cd-rom/dvd drives, extra PCI cards,network cards etc

Another suspect may be just a loose connection, try taking everything out, re-seating it. Again, pay particular attention to the RAM chips.

It could possibly even be a faulty processor, have you another you could try? Try taking it out and re-seating it.

Apr 12, 2011 | ASUS M4N75TD AM3 NVIDIA nForce 750a SLI...

1 Answer

Just installed a new motherboard model MSI 790FX - GD70 and new ram and cpu to go with it. plugged everything in and check all the connections. When we turn on the computer all the fans start and all the...

check the cable connections initially
Remove the power cord from the cpu
Remove the cmos battery and reset the bios by changing the jumper which is present to reset bios in motherboard.
Place the jumper as if it was present already
Insert cmos battery and switch on the computer

Mar 04, 2010 | MSI 790FX-GD70 AM3 AMD 790FX ATX AMD...

1 Answer

Won't boot

power supply isnt putting out enuf power

Apr 25, 2009 | Intel Motherboard

2 Answers

Newly build computer problems

i bet your power supply isnt powerful enuf for your video card.

Jan 31, 2009 | ASUS M3A78 Pro AMD 780G AM2+/AM2 Phenom...

1 Answer

Failed POST

Foxconn uses the Award bios. One beep repeating means, check for improperly seated or missing memory. You can find that here.
Remove your memory & re-seat.

Good luck!


Mar 21, 2008 | Foxconn 761GXK8MB-RS Motherboard

1 Answer

MicroATX motherboard work but the monitor shows a black screen.

I assume the monitor is turned on? Try the monitor with a known good computer to verify it's OK. I believe this board has AGP video. Verify that it's properly seated, or try another board.

Sep 13, 2007 | AMD Asus A7V-ML Socket A MicroATX...

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