PC won't boot up, sometimes. Please help!!

What's a EZ-Plug?????

Also, I updated to beta bios 0305 and no problems till now (only been 1 day with the new bios, so im not sure it really fixed my problem)

I am havign exactly the same problem. it takes a few turn on/off's to even get it to budge. you pay thsi much for a system its extremely frustrating for it not to work even after you follow the instructions of Asus by the letter. Not as high spec as the first guys which now makes me certain that this is a mobo problem.

my system is P5N32-SLI SE DELUXE, 0204 BIOS
Intel core 2 duo 6600
Asus Nvidia SLI en7900
WB 36gb Raptor 10000 drive SATA
WB 120gb IDE Drive.
ADATA 1gb DDR2-667(i think i have forgotten -_- )
ACBell 550W Psu
two dvd burners and everything is runnign at default values. and 2 case fans which use teh psu's molex connectors. even if i unplug these these make no diffrent so dotn say its psu. it does it with a 650w i brought home to try.

Any help will greatly be appreciated.

**Reapplyign thermal grease and such doesnt work at all. disconnectign and reassemblign and clearign teh bios and loading it in again doesnt work either.

**My ezplug is not installed. it is jsut an outline printed on teh board.

I'm new to computer building so before I purchase a motherboard I check them out at Newegg.com. Customers write reviews and many have problems and tell us how they solved the problem or just gave up and sent the product back.

After my system is installed I load information and programs, including a BIOS update, from the motherboard support cd that comes with the motherboard. Beyond the support cd I've rarely had to update a BIOS.

When my system wouldn't boot up I plugged in the power cord with just the motherboard and power supply connected. If the system doesn't power up maybe the power supply or motherboard are defective.

I would check out the reviews of your motherboard at newegg.com.

Do all your components meet the requirements of the motherboard?

Do not forget to connect the 8-pin EATX +12 V power plug
This will cause a similar boot up problem also.
It plugs in on the motherboard pretty close to the place where you plug in the keyboard and mouse. See users manual, if needed.

This sounds more like a bad power supply. Try a different ps.

It could be the PSU like Thelvyn suggests.

One must also consider that a BIOS error, a component incompatibility, a bad monitor, a bad video card, cabling error, bad RAM, a defective PSU, a fried motherboard component, a defective CPU, can all prevent the POST from showing.

The latest Beta BIOS is now 0403

If you know anyone else with a hefty power supply ask if you can borrow it, or try yours in their PC.

It does definately sound like a PSU issue here rather than a BIOS issue.

ok. my prob was. wouldnt post first time, had to hold the pwr buttong down, hear by wd raptor heads go TINK! hearing all the fans in the case go FULLLLLL SPEEED but no post screen. Also when it did start alot of the time the hard drive will go to sleep in the middle of loading win xp. then it would wake up and start to load iwndows REALLLLLY Slowly. --> Having tried EVERYTHING! i can let you all know flashing the bios to the newest d/lable bios 0401 works. IT boots up first time everytime from cold. i left it off for two days. and i started it after using it. i left it for a hour. i have taken oout the battery. drained all the current out of the psu also. Everything i tried to make it so it might not boot up first time failed.

so for those quickly scanning the forum for an answer.

Flashing the new bios to the newest downloadable bios 0401(20/09/06) fixes the unable to boot sometimes error. Now it boots first time everytime. And it doesnt take AGES to load windows like it used too.

If you want to know how to quickly flash without using or picking up the manual follow these steps. Its pretty much from the manual but shorter =P

step 1. create a bootable win xp floppy. Stick a floppy in the drive. Right click on the floppy drive icon in my computer and click Format.

A menu appears. Hit create a msdos start up disk. It will say zOMG all your shizzle on the disc will be erased. just click ok and make sure teh write tab on the disk is in the down position.

step 2. Format another floppy disc. Put the AFUDOS.exe and the new .ROM file on that new disk you just formatted.

Step 3. restart and make sure you select the 1st bootable device as the Floppy drive.

step 4. Let the bootable disk work its magic until you see A:\>

If you see the error, DISK IO ERROR the floopy disk is corrupt and you need to use another one. Dont compress the files either.

Take out that bootable floopy disk once windows millenium has loaded and put in the disk with afudos and your rom.

type in the following [code:1:c201033a9a] afudos i\romname.rom[/code:1:c201033a9a]
for example after typing my rom name it looked like this
[code:1:c201033a9a]A:\>afudos i\0401.rom[/code:1:c201033a9a]

it iwll say reading file and once it starts thats it. go make a cup of tea or soemthing coz next time it boots it will be ok =D

If it says soemthing like it cant read the rom file. extract it from the zip or redownload it again. it should work once you have done that.

I hope this helps. Everyone else here thanks for helping! I really appreciated it. but it wasnt memory, psu, cpu or gfx card related.

Ah thats brilliant man. Shit i dunno about you guys... but im actually startign to enjoy my computer now nothign is wrong with it lol

where did you get 0501 from? its not listed here http://support.asus.com/download/d [...] uage=en-us
thats why i said newest "downloadable" update.

you know now the games are more fun to play , watchign movies are more enjoyable. maybe because there isnt that nagging problem you always had to worry about when you turned it on heh

it seems that the problem is a power issue try with another psu no less than 600w.

hello, hope someone can help me: im having the same problems as the original post mentioned.

i've tried with almost all new componentes mobo,cpu,video card,psu but the problem won´t dissapear, coul it be that some of the old parts of the first machine that had the problem,damaged the new ones because i did not replaced all the parts at once, i used them with the new mobo,cpu and memory.

I would really appreciate any help, thanks in advance