Forum Home
Press F1
Thread ID: 23968	2002-08-31 00:19:00	how to reset bois via hardware	loser (538)	Press F1

Post ID	Timestamp	Content	User
75170	2002-08-31 05:43:00	Just read my manual - should be "delete" key	Peter H (220)
75171	2002-09-01 02:04:00	Peter, If you read his first post you will realise that the CPU doesn't do anything, so he can't boot. Can't boot, can't hold del. Sorry. I have just thought of an idea, will check it out and get back. G P	Graham Petrie (449)
75172	2002-09-01 09:29:00	yes I definitely cannot boot or hold f8 or delete or anything. The latest is that i've taken the battery out and disconnected the PSU from the motherboard. Been like that for 24 hours. Might try hooking it up to a monitor and stuff tomorrow. Meanwhile will read through the manual that took 4 hours to download on my parents 486 with one SHONKY internet connection. If that doesn't work, I'll see if I can "reset" it with a hammer... Cheers everyone.	loser (538)
75173	2002-09-01 11:46:00	I just had a look, and your mobo has a dual BIOS. Is it possible for you to boot to the second (backup) BIOS?? If not, I am assuming it is a CMOS problem as doesn't the CMOS load the BIOS? If so, then the PC would boot that far before the BIOS CPU voltage control took over. Hopefully it will work when you replace the batt. I will keep looking. G P	Graham Petrie (449)
75174	2002-09-01 14:05:00	Just us the CLR_CMOS jumper, turn off PC, set jumper (pins 2-3?), wait 5 secs, reset jumper (pins 1-2?) turn PC on, and wolla!, problems solved, if you do not want to open the PC up, another way that works on some motherboards (Including my MSI) is to HOLD DOWN THE DELETE KEY, AND TURN THE PC ON WHILE IT IS HELD DOWN!, this then loads the bios defaults, and wolla! problems solved! Ive done the A LOT, (overclocking etc.), if you set the FSB too high, doesn't boot!	Dragonslayer (512)
75175	2002-09-01 23:49:00	alrighty, cheers. Hey, when you say "set the jumper", how do I actually do that? There are no pins on the motherboard to stick on of those little plastic jumpers on, so do I just use like a little piece of bent wire or a pair of tweezers or what? I don't have any problems with playing with the insides of a computer, but I've never had to set jumpers where you can't just use one of those plastic things. Graham: I thik the way you are supposed to look at it is that the CMOS stores the settings from your BIOS. It doesn't "load" the bios as such. I don't think that you can actually manually boot to the backup bios chip. I believe that it just takes over automatically if the main bios craps out. Of course in my case there is nothing actually wrong with the bios -- the problem is with the setting that I set....	loser (538)
75176	2002-09-02 04:35:00	Didn't the disconnected battery do it? Unplugging the PSU was a bit extreme ... just making sure it hasn't got the 230V in is enough. You could try the "clr cmos" trick ... if there are only 2 pads, shorting them with tweezers for a second or two should do the trick. But I suspect that you have got a cleared CMOS after 24 hours. The CMOS is "non-volatile" storage for the BIOS settings --- it's a lookup table. I just wonder whether the voltage setting is one of the values stored there. It could easily be stored elsewhere such as in a (cmos) hardware latch (because this is potentially a smoke generating thing). The CPU has to have the correct voltage. I don't think it would be very safe to have the voltage being set only after it has executed some code in the BIOS.	Graham L (2)
75177	2002-09-02 05:03:00	Yeah na it's cleared now after having the battery out. I tested it earler today. Actually there are 3 clr cmos pads. Otherwise I would have jumped right in and shorted them probably... > to have the correct voltage. I don't think it would > be very safe to have the voltage being set only > after it has executed some code in the BIOS. Maybe it autodetects a voltage to boot initially, and then alters it if it finds something set different in the BIOS? I'm only guessing really.	loser (538)
75178	2002-09-02 05:03:00	If the system is, as it sounds like it is, completely dead, then I'd suggest your problems are either with your power supply or CPU. It might be that your power supply didn't like the voltage changes and it blew its fuse? Otherwise, as Peter said, pressing F8 should get things back as they were if it was simply a problem with an incorrect setting.	Brent P (198)
1 2