My PC is Dell T3400. when I start my PC , it is unable to boot. furthermore, it sometimes doesn't show BIOS and boot menu by pressing F2 and F5 or F12 keys.. it doesn't load windows 7 and following message appears: I/O card parity interrupt at F000:3990 Type (S)hut off NMI, (R)eboot, other keys to continue I/O card parity interrupt at 3990:50B5 Type (S)hut off NMI, (R)eboot, other keys to continue I/O card parity interrupt at F000:A8C5 Type (S)hut off NMI, (R)eboot, other keys to continue Please help me out to fix this problem....

If this desktop can boot to BIOS properly, then you can download the BIOS file from Dell's website, make a bootable media (using other computer) and use this media to update your T3400 BIOS.

1turn off your dell dos not mether what order is.
Press "F2" as soon as the LEDs first blink on your keyboard. F2 must be pressed before your operating system starts to load. If you miss your chance, start over and try again.
after find the menu named : boot order and put the first one wich one you want .save ,exit and there you go

Does the screen show anything at all during boot-up (BIOS screen, startup info?) If so, try connecting an external monitor after startup and see if the issues persist when setting the video output to the external monitor. If that doesn't work try booting in safe mode to last known configuration that worked (usually done by hitting F2, F5, or F8 shortly after powering on.

At boot time repeatedly pressing either, F2 , F12, or possibly Fn+F1 this is depending upon the bios wether it has been updated or upgraded. One of these should do the trick.....

Straight from the Dell website:

1. Turn on (or restart) your computer.
   
   
2. When "F2 = Setup, F12 = Boot Menu" appears in the upper-right corner of the screen, press .
   
   

If you wait too long and the operating system logo appears, continue to wait until you see the Microsoft Windows desktop. Then shut down your computer and try again.

I hope this answers your question!

Power on your system, Press F2 on Dell logo. This would take you to system BIOS. Ensure that USB controller is ON, and USB emulation is also set to ON. Save settings and Exit. System would reboot now. Press F12 on Dell logo, and select USB ROM as the boot device. This should boot your computer through your External drive. If it still doesnt work, try switching to a different USB port. If none of these steps work, it may be a problem with the boot sector on your External drive.

Good Luck!
Abhishek

Try to change the boot sequence or set your bios to defaults. Restart the computer. tap f2 on the dell logo. Press alt and F together. press alt and B together. Press Y if you get a prompt to 'save changes and exit?'.

If it still doesnt work. go back to the bios. restart. tap f2 on the dell logo. go to 'Integrated devices'. disable the network interface card'. Press Alt and b together. then try to boot the computer. Pls post back if it works.

First of all, GX150 is a PIII with 1GB of memories max.

do you know how to get into the BIOS?

press F2 when you start up the machine. if the BIOS don't come up the first time. shut-down the machine manually and try again.
after you get into the BIOS go though all if the settng and make sure they look OK. (if you have no idea what they are, DOn't change it). and make sure CD is the first boot device. press F10 to save and exit.
insert the cd in the CD tray and startup the machine.
look at the screen, and press enter when the screen tells you boot from the cd.
follow the instruction on the screen and reinstall the OS.

The F5 and F8 functions are normally used by Windows to shoose between C:\, Safe Mode and normal boot.

Setup is a function of the BIOS manufacturer and it could be any key but is normally F1 or F2 as the screen says in your case.

I don't know what your specific problem is but it is a new board and sometimes they don't survive the installation due to improper handling.
The almost universal use of CMOS technology makes some of the chips very sensitive to static discharge even with countermeasures in place to protect them.

F8. If that isn't it I would go up to F11. The important thing to remember is you may have to repeatedly tap it starting as soon as you see the Dell logo on your screen. Let me know if this helps. I may need more info on what exactly you are wanting to accomplish. I am writing this as to help you with getting to the area of your computer that deals with how it boots up. Meaning that you will need to change it from hard disk to cd rom. If this is not what you are looking for let me know [email protected] and I am sure I can be of further assistance to you.