I just formatted my hard drive and installed Windows XP. I had Win 98 SE on it before. Anyway, STANDBY doesn't show up. Not even if I hold Shift in the shutdown box (on the other XP machine Hibernate switches to Standby when you hold shift). And since I use standby so much, I'd really like to have it back. And yes, my computer supports ACPI (which Windows refused to detect completely).

EDIT:
I thought I had specs in my signature. I guess not.
eMachines eTower 366i
533MHz Celeron
256MB RAM
20GB HD
4MB ATI Rage IIc AGP
This is most likely to be caused by a driver problem.  And I mean ANY driver.  It could be a printer driver, sound card driver, etc.  Best advice is to ensure you've got all the most up to date drivers for all of your hardware.  Bring your XP installation fully up to date with Windows Update.  Then see if the problem remains.The 366i is a 366MHz processor, in its original configuration, and only had a 4.3GB hard drive: http://www.epinions.com/S0635170-etower_366i/display_~full_specs

Have you upgraded the processor and hard drive?  Even so, with the original onboard video which only allocates 4MB of system memory to video, I think you have a very marginal system to be RUNNING Win XP.  I would have stayed with Win 98SE with that computer.  Yes, the processor and hard drive have been upgraded. I was going to get NEW sound card drivers today. But it doesn't appear that there are any new video card drivers. I'll check ATI's website. Thanks for the suggestions!

-JohnWell, I was not suggesting updating video drivers, although certainly might be a good idea.  I meant that your video capacity with your current hardware is quite limited for Win XP.  You might think about installing a PCI video card, one with at least 32MB of video memory.  I believe you do not have an AGP slot, so PCI is the only option for a hardware video upgrade.  ebay is an option.  If you wanto to keep the cost to a bare minimum, something like this would be one option: Verto PNY GeForce2 MX200 PCI 32MB Video / grafix card  For a card with 64MB of memory, something like PNY Virto GeForce2 MX400 64Mb PCI Video Card  You might find some better buys; I just picked that one for sake of conversation.  Also, I'm biased toward nVidia.  So, look at ATI also.

For new options, take a look at http://www.tigerdirect.com/applications/category/category_slc.asp?Recs=10&Nav=|c:319|&Sort=0
  
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Well, I was not suggesting updating video drivers

I believe you do not have an AGP slot

This is most likely to be caused by a driver problem.  And I mean ANY driver.

Even Windows XP's own drivers?

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Even Windows XP's own drivers?

Especially Windows XP's own drivers.  Microsoft do not make soundcards, printers, etc...

Eek.  Ancient hardware and XP are not a great combination.  I see that ATI no longers provides XP drivers for that graphics card (if it ever did).

Would now be a good time to extol the virtues of Linux?    Alternatively, you can try upgrading your computer, or just ditch it and start again.