Just built p4p800 posts but then re-boots help....

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steve s

asus p4p800
2x512 pc3200 a1 b1
2.8c p4
ide drives 20 gig master 60gig slave-using ata cable
2 cd roms
the bios comes up- everything looks okay, it sees the ram cpu and drives

But when it goes to boot, it posts, then resets itself.
I tried 1 stick of the ram in a1.same
The drives were working in the previous system.
Would really appreciate some help, little bewildered now.
 
Perfomed the slow boot option. Posts then it says hit escape to boot, counts
down beeps once then reboots.
The maseter drive is ata/66 with the black connector, slave has grey
connector.
ati 9800 video card. windows xp
What am I missing???
 
steve s said:
asus p4p800
2x512 pc3200 a1 b1
2.8c p4
ide drives 20 gig master 60gig slave-using ata cable
2 cd roms
the bios comes up- everything looks okay, it sees the ram cpu and drives

But when it goes to boot, it posts, then resets itself.
I tried 1 stick of the ram in a1.same
The drives were working in the previous system.
Would really appreciate some help, little bewildered now.
Click to expand...

Might be a power problem. Have you checked that the 4-pin P4 power cable is
connected to the motherboard?

My 2c worth.

Keithm
 
Yep the 4 pin plug is attached, hw monitor says the voltages look okay.
I have a 400w supply approved for p4, axio ps 12a capable on the 12v line.
It's hard to figure when ram,mb and case are brand new.
 
steve said:
asus p4p800
2x512 pc3200 a1 b1
2.8c p4
ide drives 20 gig master 60gig slave-using ata cable
2 cd roms
the bios comes up- everything looks okay, it sees the ram cpu and drives

But when it goes to boot, it posts, then resets itself.
I tried 1 stick of the ram in a1.same
The drives were working in the previous system.
Would really appreciate some help, little bewildered now.
Click to expand...


Did you Clear RTC RAM (Manual, p. 2-20)? Perhaps it helps...

Roy
 
"steve s" said:
Yep the 4 pin plug is attached, hw monitor says the voltages look okay.
I have a 400w supply approved for p4, axio ps 12a capable on the 12v line.
It's hard to figure when ram,mb and case are brand new.
Click to expand...

Yikes. If you only have 12V @ 12A, as soon as the ATI9800 cuts in, your
12V will crap out. Presto, mobo resets and tries again. Some
very rough numbers - 12V @ 15A (basic config with cheezy video card)
or 12V @ 20A (basic config with ATI9800/FX5900 type high end card).
I did a post recently about this - you can look up the numbers for the
stuff on your board and do a similar analysis:

******
To work out the numbers for +12V, seeing as it is critical, I use

Processor
P4 3.2Ghz/FSB800/512KB cache = [email protected] = 8.4A@12V
Athlon 3200+/FSB400/512KB = [email protected] = 6.4A@12V
including 80% conversion efficiency, the required current is
10.5A or 8A for a top end P4 or Athlon respectively.
Hard drive
2A during spinup of the disk, 0.5A while sitting in Windows desktop.
Allow 0.5A for a CD. If you don't have a lot of drives,
don't worry about spinup current, and concentrate on idle current.
Fans
Allow 1 amp for case and CPU fans.
Video card
Low end video cards use no +12V. An Nvidia FX5900 or an ATI9800
have a separate +12V cable, and as the video cards draw up to 70W
when gaming, a maximum of 6 amps would be required. Unless you
are buying one of these, a lesser number is more appropriate.
Total = 15A for a basic system, with some margin. If buying a
video card that requires extensive cooling, this number is more
like 20A.
******

An addendum to that calculation - I just searched in Google, and
this site lists estimated power numbers for video cards. It seems
the aux power on the video card is listed as coming from +5V, which
I find a little strange, as +5V is too high to run a chip directly,
and wouldn't be my first choice for powering a converter, due to the
currents involved. Anyway, a 9700pro is listed as [email protected] and
[email protected], and I've used that estimate in the calc below.

http://takaman.jp/psu_calc.html?english

The P4 2.8C is [email protected] --> 8.7A@12V from 2x2 connector.
Hard drive --> 0.5A at idle (I'm assuming no CD in CDROM drive)
Fans --> 1A est.
Video card = 1.5A (using takaman estimate to represent ATI 9800)
Total with min hardware in gaming application = 11.7A from a 12A supply.
The situation is marginal.

http://groups.google.com/[email protected]

This picture gives "total" power for some video cards, but without
the essential breakdown into supply rails needed for the calc above.

http://www.tecchannel.de/hardware/907/images/0011358_PIC.gif
http://www.tecchannel.de/hardware/907/images/0011359_PIC.gif

Here is a measurement of an ATI9700:

http://forums.viaarena.com/messageview.cfm?catid=31&threadid=48125&FTVAR_MSGDBTABLE=

"I'm just measuring how much radeon is taking current direct
from power supply some results:
desktop 5V line 2.8A , 12V line 0.17A
3dmark01se running 5V line 3.8A , 12V line 0.8A "

HTH,
Paul
 
steve s said:
asus p4p800
2x512 pc3200 a1 b1
2.8c p4
ide drives 20 gig master 60gig slave-using ata cable
2 cd roms
the bios comes up- everything looks okay, it sees the ram cpu and drives

But when it goes to boot, it posts, then resets itself.
I tried 1 stick of the ram in a1.same
The drives were working in the previous system.
Would really appreciate some help, little bewildered now.
Click to expand...

Recently replaced an Intel 845BG(doesn't post anymore, no beeps or video)
with the ASUS P4P800 and been having similiar problems.

The biggest problem is WinXP refuses to boot from either the HD or CD-ROM.
When running Safe Mode, it gets to a file called agp440.sys then resets.
Switching to a PCI video card made no difference. Also updated to the
latest BIOS, still nothing.

Booting from DOS or Windows 98 CD exhibits no problems.

The system is as follows:

ASUS P4P800
1.6 P4 CPU
NVIDIA video card(MX400, have to double check that)
256MB RAM
40GIG HD
DVD ROM
CD Writer
350W powersupply (we tested this with the old motherboard, it was working
fine)
 
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