Toshiba lcd # 42hli67 blimks orange light and wont turn on

perform the 'Flashlight test'
. LCD LED TV Repair No Image Blank Black Screen Flashlight Test How to Fix...

Okay, what does that light indicate? (hard drive activity, power plugged in, battery, etc). It most likely indicates a faulty power supply or damaged battery unit.

Toshiba Regza 37in - 37HL17
TV will not turn on - Yellow power ind. Light blinks three times...
Fixed with a firmware update (hard to believe, but true). Search Google for a file named: 2007SEN069.zip (don't worry if the page you find it on doesn't mention the 37HL17 - it worked fine). Unzip the file, and copy the 3 folders and 3 files to the root of a small SD card. The SD card MUST be 2GB or less in size (I used a 1GB card), and it MUST be formatted with FAT-16 (not FAT-32). Mine was pre-formatted as FAT (FAT-16). The SD port is on the back of the TV behind a cover plate near the power cable. You do NOT need to remove the back cover of the TV, just the small cover plate (1 screw). UNPLUG the TV; remove the cover plate; insert the SD card (prepped as explained above); Plug in the TV; Watch the yellow lights blink, then turn blue, then go dark; UNPLUG the TV; remove the SD Card and replace the cover; Plug in the TV; Yellow lights will blink a few times (this is normal); when blinking stops, turn on the TV and you should be good to go. :-)
Pictures attached are from a Toshiba software upgrade bulletin I found online.

<P>Unplug it for about an hour to let it reset itself first, if it still does not work then it may be in the safety shutdown mode due to short circuts in the power supply or in the backlight inverter board.</P><P><B><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN></B></P><P><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'"><o:p>&nbsp;</o:p></SPAN></P><P><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">Please see my basic troubleshooting guide here:<o:p></o:p></SPAN></P><P><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'"><A href="http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide">http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide</A><o:p></o:p></SPAN></P><P><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'"><o:p>&nbsp;</o:p></SPAN></P><P><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'; mso-bidi-font-size: 12.0pt"><A href="http://s807.photobucket.com/home/budm/allalbums"><FONT color=#800080>http://s807.photobucket.com/home/budm/allalbums</FONT></A><o:p></o:p></SPAN></P><P><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'; mso-bidi-font-size: 12.0pt"><o:p>&nbsp;</o:p></SPAN></P><P><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'"><A href="http://en.wikipedia.org/wiki/Capacitor_plague">http://en.wikipedia.org/wiki/Capacitor_plague</A><o:p></o:p></SPAN></P><P><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'; mso-bidi-font-size: 12.0pt"><o:p>&nbsp;</o:p></SPAN></P><P><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'; mso-bidi-font-size: 12.0pt">Parts: <A href="http://www.shopjimmy.com/">www.shopjimmy.com</A><o:p></o:p></SPAN></P><P><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">Capacitors kit: <A href="http://lcdalternatives.auctivacommerce.com/Viewsonic-C196320.aspx"><SPAN style="mso-spacerun: yes">&nbsp;</SPAN>http://lcdalternatives.auctivacommerce.com/Default.aspx</A> he can make you a set of caps.</SPAN><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'; mso-bidi-font-size: 12.0pt"><o:p></o:p></SPAN></P><P><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'; mso-bidi-font-size: 12.0pt"><o:p>&nbsp;</o:p></SPAN></P><P><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'; mso-bidi-font-size: 12.0pt">Please post back what you find. <o:p></o:p></SPAN></P><P>&nbsp;</P>

I would check the ballast assy and make sure it is good if that is fine check the color wheel

what makes it not trun on

battery is too low to operate the screen orange light usually means it is trying to charge

Try this fix from the toshiba website. Q. I have no picture or sound, but I have a blinking power light?
Models: LCD-2007
REF:FAQLCD00090
1. Try resetting the TV by disconnecting the power for 30 seconds and then plugging it back in. If this has no
effect, try moving the TV to a different power outlet that has been tested and is known to be good.
2. If your unit continues to fail, please contact our Customer Solutions Department at 1-800-631-3811 Monday
through Friday, from 8 a.m. until 7 pm CST for a local Toshiba Authorize Service Station Hope this helps you with your problem.

I am having the same problem with the blinking orange light

Its probably not the BIOS but the board warping beneath the CPU Socket or similar.. Dont flash it (BIOS) or it will probably kill the chip. Let me look up the model number...