Weird boot behavour


W

Wox

Hi,

This is what happens when I try to boot my PC (stats below):
1. Fans start spinning, HD and Power LED go on.
2. Than it shuts down (this is after ±2 seconds) Didn't show anything
on the screen, no POST beep codes.
3. ±3 seconds later it starts up again by itself
4. Sometimes it boots normal at this point, sometimes it shuts down
again and tries yet again until it boots normal.

I'm not an expert, but I thought when booting this happens:
1. PSU performs self-test and send "Power Good" signal to mobo.
2. Timer chip stops sending reset signal to CPU.
3. CPU load ROM BIOS
--- At this point it beeps when something goes wrong ---
4. Execute BIOScode; BIOS performs some tests (beeps on error)

Since the power LED is on, the error must happen when the CPU tries to
load and/or execute the ROM BIOS code. What happens normally if an
error is issued here? Does it shut down and start up like it happens
in my case?

Thx,

Wox


MSI P35 NEO-FI Intel P35 Express Socket 775
INTEL Core 2 Quad Q6600 2.40 Socket 775
ANTEC Sonata III 500W
PREMIUM 1024MB DDR2 PC6400 800MHZ Value Series
MSI NX8500GT-TD256EH/D2 256MB PCI Express Nforce 8500GT
WESTERN DIGITAL 500GB-KS 16MB SATA300 7200RPM
BIOS: AMI v1.3
 
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P

philo

Wox said:
Hi,

This is what happens when I try to boot my PC (stats below):
1. Fans start spinning, HD and Power LED go on.
2. Than it shuts down (this is after ±2 seconds) Didn't show anything
on the screen, no POST beep codes.
3. ±3 seconds later it starts up again by itself
4. Sometimes it boots normal at this point, sometimes it shuts down
again and tries yet again until it boots normal.

I'm not an expert, but I thought when booting this happens:
1. PSU performs self-test and send "Power Good" signal to mobo.
2. Timer chip stops sending reset signal to CPU.
3. CPU load ROM BIOS
--- At this point it beeps when something goes wrong ---
4. Execute BIOScode; BIOS performs some tests (beeps on error)

Since the power LED is on, the error must happen when the CPU tries to
load and/or execute the ROM BIOS code. What happens normally if an
error is issued here? Does it shut down and start up like it happens
in my case?

Thx,

Wox


MSI P35 NEO-FI Intel P35 Express Socket 775
INTEL Core 2 Quad Q6600 2.40 Socket 775
ANTEC Sonata III 500W
PREMIUM 1024MB DDR2 PC6400 800MHZ Value Series
MSI NX8500GT-TD256EH/D2 256MB PCI Express Nforce 8500GT
WESTERN DIGITAL 500GB-KS 16MB SATA300 7200RPM
BIOS: AMI v1.3


I'd try another power supply and see what happens
 
K

kony

Hi,

This is what happens when I try to boot my PC (stats below):
1. Fans start spinning, HD and Power LED go on.
2. Than it shuts down (this is after ±2 seconds) Didn't show anything
on the screen, no POST beep codes.
3. ±3 seconds later it starts up again by itself

This is a common bug with P35 chipsets. You can wait and
see if a bios update cures it, but for the time being are
you overclocking? That will introduce further variables and
if it doesn't happen overclocking, or without ANY bios
changes, you may have to choose between bearing this or
switching chipsets (motherboards).

4. Sometimes it boots normal at this point, sometimes it shuts down
again and tries yet again until it boots normal.

If it keeps trying it's possible your memory isn't entirely
compatible, you could try different manually set timings or
different memory, but at least run memtest86+ overnight to
be sure it's at least stable if/when it does boot and run
that.

I'm not an expert, but I thought when booting this happens:
1. PSU performs self-test and send "Power Good" signal to mobo.
2. Timer chip stops sending reset signal to CPU.
3. CPU load ROM BIOS
--- At this point it beeps when something goes wrong ---
4. Execute BIOScode; BIOS performs some tests (beeps on error)

Since the power LED is on, the error must happen when the CPU tries to
load and/or execute the ROM BIOS code. What happens normally if an
error is issued here? Does it shut down and start up like it happens
in my case?

Normally I'd agree that a methodical interpretation of
what's happening might be useful, but in this case with P35
chipset, it is an expected issue. If you are running any
particular memory:bus ratio you might also try a different
ratio, but you didn't give any details of this.
MSI P35 NEO-FI Intel P35 Express Socket 775
INTEL Core 2 Quad Q6600 2.40 Socket 775
ANTEC Sonata III 500W
PREMIUM 1024MB DDR2 PC6400 800MHZ Value Series
MSI NX8500GT-TD256EH/D2 256MB PCI Express Nforce 8500GT
WESTERN DIGITAL 500GB-KS 16MB SATA300 7200RPM
BIOS: AMI v1.3

At least check on a bios update, but be aware a new bios
isn't always better than what you have or a prior bios.
 
W

Wox

This is a common bug with P35 chipsets. You can wait and
see if a bios update cures it, but for the time being are
you overclocking? That will introduce further variables and
if it doesn't happen overclocking, or without ANY bios
changes, you may have to choose between bearing this or
switching chipsets (motherboards).


Thanks for your reply. I'll do the memtest and update the BIOS, see
whether this helps. (Btw, I'm not overclocking.)

Would you have any reference for this "common bug with P35 chipsets"
or is it personal experience?
 
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K

kony

Thanks for your reply. I'll do the memtest and update the BIOS, see
whether this helps. (Btw, I'm not overclocking.)

Would you have any reference for this "common bug with P35 chipsets"
or is it personal experience?

Did you Google search for this?
http://www.google.com/search?q=P35+double+boot

Better yet, find a popular motherboard forum with fellow
users of your board make/model. I don't know which are most
populated by MSI owners these days but here is one example,
http://forums.pcper.com/forumdisplay.php?f=106

MSI might have their own forum these days? Just an idea, I
haven't checked for one.
 

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