Cannot reach boot selector screen

With OS 10-3-9, I selected a bad boot device. Now boot fails with msg Input not supported.
How do I get back to the boot selector screen to select the correct boot device? I have no 10.3 bootable disks.
The keyboard is connected via usb only.
This is on a Mac g4, 400 MHZ

What happens if you disconnect the unbootable disks?
Try resetting ther PMU
Resetting PMU on Power Mac G5, Power Mac G4, Power Macintosh G3 - Apple Support
This is on the 400 MHz G4 right?
There is a PowerMac forum
Power Mac

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HP MS218 Not Booting - Does not POST - Cannot reach BIOS

Hello,
I have an MS218 (product number: BR372AA #ABA) that I have been having issues with. It used to work fine (ran on WinXP), but currently will not even boot properly at all. No software or hardware changes were made to cause this problem to begin occurring, it simply just started happening one day when I went to turn the computer back on. The issue that I am currently experiencing is as follows:
- Power stays on, but nothing is ever displayed on the screen
- Does not post, cannot reach BIOS
- Acts almost as if it is resetting itself constantly, the fan in the back will start to spin for a second or two, then stop, then start again, and repeat indefinitely until I unplug the power adapter.
I initially figured it was a hardware issue, likely the motherboard, and began to troubleshoot the problem. As I removed non-vital components, the problem would persist. For instance, it happens regardless of external things (keyboard, mouse, etc.) being plugged in, or regardless of the hard drive or optical drive being plugged in. It still appears to happen in the absense of memory, however, I will instead hear beep codes (likely telling me that I don't have any RAM in). Ultimately, I decided to order a replacement motherboard, which recently arrived. Upon replacing the motherboard, the exact same problems happen, which leads me to believe that the motherboard was somehow not the culprit. I have also tried multiple power adapters to no avail, as well as resetting the CMOS battery without any luck. I'm really at a loss for what to do from here, and am currently sitting on hold with HP tech support.
Any advice is welcome. Thanks in advance for your time and assistance.

Hello Jaycera,
There are two more components that we haven't replaced or look at and I would approach them in the order listed.
1. Power supply
2. Processor
It sounds like it's a power issue the computer is getting enough power to start booting up and then losing it. Thus anytime I hear a power issue the first thing I think of is a power supply issue.
The other thing is it could be the processor. The computer starts booting, makes a call to the processor, fails, boots down, starts booting up, makes a call to the processor and here we are in a vicious cycle.
It could just be the processor needing reseated. Take it out, put it back in and make sure it's in properly and no pins are bent, or the processor could be bad.
If I have helped you in any way click the Kudos button to say Thanks.
The community works together, click Accept as Solution on the post that solves your issue for other members of the community to benefit from the solution.
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How do I fix the GRAY boot-up screen with FLASHING QUESTION-mark FOLDER?

When I turn on the MacBook Pro laptop, I opened up the Safari Browser and its when the problem started. It was stuck on an loading infinite loop. I decided to force quit the application and/or turn off the mac by the Menu options, It did not work. So I did a "Hard" Shut-down and restarted the Mac, the Boot up screen stood gray for like a minute until the Flashing ? Folder icon showed up!.
My sister's laptop's warranty is expired so I wonder how can I fix it without having to spend too much money on a simple troubleshooting tip.
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Ok, now I am stuck:
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Holding option on boot does not bring up boot selection screen

Holding option on boot does not bring up the boot selection screen, the machine just boots from the previously selected startup drive.
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SL 10.6.7
I created a three partition drive on a Seagate GoFlex 1.5 TB drive. GUID partition table.
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Are you using a Bluetooth keyboard by any chance, I see that same behaviour at times if so ?
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Dear all,
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Exact description:
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- I opened the laptop, if there is any visible problem. There isn't. After opening and closing, I could once switch to the BIOS, but there was no reaction to any further key pressing. So I could not reset the BIOS to some default state.
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Message Edited by lm1976 on 11-21-2008 10:56 AM
Message Edited by lm1976 on 11-21-2008 11:04 AM
Message Edited by lm1976 on 11-21-2008 11:13 AM
Message Edited by lm1976 on 11-21-2008 11:27 AM
Solved!
Go to Solution.

Another shot in the dark...can you swap the CMOS battery with one from your R50?
If we don't have a BIOS that is messed-up (which is an unfortunate option) sheer persistance and attention to small details might get us somewhere...
My knowledge is really of little use right now, as is my experience. Personally, I'd keep the HD out, along with battery, wireless and BT cards and keep attempting to get it to boot in different intervals...not much science there, but that's the best I've got right now, I might be smarter a little later...or never...
Also, applying permanent pressure of a light nature on the spot where keyboard enters the planar as in couple of bent "post-it" sheets might be worth considering...
Good luck and keep us posted.
Cheers,
George
In daily use: R60F, R500F, T61, T410
Collecting dust: T60
Enjoying retirement: A31p, T42p,
Non-ThinkPads: Panasonic CF-31 & CF-52, HP 8760W
Starting Thursday, 08/14/2014 I'll be away from the forums until further notice. Please do NOT send private messages since I won't be able to read them. Thank you.

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Hi! This seems to bee a common problem (i. e. https://discussions.apple.com/thread/4094417?tstart=0) and i have it as well. As usual you can't get help here but a lot of inspiration
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Reinstall Lion.
Reinstalling Lion
Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alterhatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
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Macbook Pro stuck on boot-up screen

When I woke up this morning, I found that my Macbook Pro has turned off while I was sleeping (I have it on constantly for convinence sake because it takes to darn long to boot-up), So I didn't think about it. Untill I found out that it would not boot on. Let me explain what happens
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ShadowofColosuss708,
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Cannot reach boot selector screen

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