Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations strongm on being selected by the Tek-Tips community for having the most helpful posts in the forums last week. Way to Go!

NEW self built PC powers on for about 1 sec then shuts off 1

Status
Not open for further replies.
djbeenie

djbeenie

Technical User
Jun 20, 2002
134
US
MSI nForce2 Ultra 400 Chipset Motherboard for AMD Socket A CPU, Model "K7N2 Delta-L"

Specifications:
Supported CPU: Socket A AMD Athlon/AthlonXP/Duron Processors
Chipset: nVIDIA nForce2 Ultra 400 + MCP
FSB: 200/266/333/400MHz
RAM: 3x DIMM support DDR400/333/266/200 Max 3GB
IDE: 2x UltraDMA 133 Max 4 Devices
Slots: 1x AGP 4X/8X, 5x PCI, 1x ACR
Ports: 2xPS2,1xCOM,1xLPT,1xLAN,6xUSB2.0(Rear 4),Audio Ports
Onboard Audio: Realtek ALC650 6-Channel Codec
Onboard LAN: 10/100M Fast Ethernet
Form Factor: ATX

I'm putting in a AMDXP 3000 400FSB
Memory - Simple Tech PC3200 512mb DDR

All peices are brand new. CPU is seated correctly. I have a weak fan at the moment. But that shouldn't shut the system down that fast. All the peices are not in the case yet. They were but it was doing the same thing inside the case. I'm clueless, can anyone help?

Regards,
Bryan

dj beenie
 
Sort by date Sort by votes
try checking all the connections again.

how many watts is your power supply? your problem might be related to your psu.

and what video card are you using? are you using one of those that require a "power dongle" to power up?
 
Upvote 0 Downvote
Ok I have tried with another PSU and it does the same thing. Turns on for little less than a second and then shuts off. I have reset the BIOS. Still nothing. I usaly have to let it sit for about 5-10 mins before it will do that whole "power on thing for sec". I'm clueless. Do you think it needs to be grounded?

Regards,
Bryan

dj beenie
 
Upvote 0 Downvote
It does not need to be grounded at this time but the weak fan bothers me. AMD processors are little blast furnaces and can destroy themselves in under 10 seconds if not properly heatsunk. replace the fan! take the mobo out of the case and install only the cpu and good heatsink. If there is an onboard speaker your OK but if not hook up the case speaker and see if you get a beep. If not the mobo or CPU is bad. (afterthought, it may still be the PS)
 
Upvote 0 Downvote
True about the weak fan, but the pc doesnt stay on long enough to do anything. We are talking little under 1 second. Ok I found out this as well.. I tried unplugging the PSU and then tried the powerswitch again, and it turned on again, but only for under a sec.

dj beenie
 
Upvote 0 Downvote
Newer motherboards will turn off power if no CPU fan is detected. Does your "weak" fan contain a rotational sensor and is it functional? Is it plugged into the CPU fan header on the motherboard?
 
Upvote 0 Downvote
It is plugged into the CPU header. Not into the powersupply. I don't think it likes my FAN. And no, I don't think it has a rotational sensor on it. I have even tried to just unplug the fan and try it from there. Yes I know that was pushing it, but that seems to be not the case either.

I want to thank everyone helping me with this. Thanks so much.

Regards,
Bryan

dj beenie
 
Upvote 0 Downvote
Only the newer ones. The older ones have 2 connections and use an adapter to connect with the mobo. These can be connected directly to the power supply (as in hard drive connectors), or with an adapter to the mobo as aux. fans.
 
Upvote 0 Downvote
What people are saying is that the motherboard must have a 3 pin fan plugged into the CPU fan header.
The motherboard needs to detect the fan spinning or otherwise it will just turn off.
So you fan maybe faulty.
Some motherboards also have problems detecting the RPM signal from low spinning 70/80mm fans, these are now quite popular on newer heatsink/fan units, favoured because they produce less noise.
If you have a spare fan with this type of 3pin connector you could just try connecting it to the CPU header (just point the fan close to the heatsink (it will be OK for a short test period)
Also have you got the heatsink on the correct way around? the recess in the base of the heatsink must be positioned over the raised cam box on the CPU socket otherwise the base of the heatsink doesn't sit squarely on the CPU core, this causes the CPU to rapidly overheat and the thermal protection on the motherboard to "shut down" the PC.
One obvios but vital thing, a small quantity of thermal paste must be applied to the raised CPU core (in the absence of a thermal pad)
If you havn't already done so, only connect the bare minimum of components and wires.
CPU +heatsink/fan, graphics, one stick of ram and the PSU main harness plug (you may also need the extra P4 plug if necessary) as some motherboards need the extra 4 pin power plug connecting to work correctly.
Martin


Replying helps further our knowledge, without comment leaves us wondering.
 
Upvote 0 Downvote
Thanks guys, the problem is solved. Looks like the heatsink wasn't pushed down hard enough. It's working like a champ now. Thank you guys so much for your input. It pointed me in the right direction. I absolutly love this message board. :)

Regards,
Bryan

dj beenie
 
Upvote 0 Downvote
djbeenie
"Looks like the heatsink wasn't pushed down hard enough"
??? it was either fastened or not fastened???
So was it on the wrong way around?
Martin

Replying helps further our knowledge, without comment leaves us wondering.
 
Upvote 0 Downvote
Well to be honest, I didnt know it had to be pushed down hard. Since the fan was not the right size for the CPU, no it was not snaped in good. So there was really no preasure. But now I have a new fan and is snapped in secure, it works like a champ. Thank you guys again for your input.

Regards,
Bryan

dj beenie
 
Upvote 0 Downvote
Status
Not open for further replies.

Similar threads

Bryan - Gendev
  • Locked
  • Question
Mouse not active after return for sleep WIN11
Replies
4
Views
346
xwb
xwb
kenthephoneman
  • Locked
  • Question
New PC Restart problems
Replies
2
Views
118
technome
technome
pmonett
  • Locked
  • Question
Need to change OS on HP laptop 1
Replies
10
Views
396
Rick998
Rick998
DrB0b
  • Locked
  • Question
Creating new intranet for dummies 2
Replies
4
Views
127
DrB0b
DrB0b
T3kk
  • Locked
  • Question
UX Volume visual no longer showing on screen when the Volume button is pressed on headset 2
Replies
4
Views
599
Scott24x7
Scott24x7

Part and Inventory Search

Sponsor

Back
Top